Constance Greene confronts Manhattan’s most dangerous serial killer, Enoch Leng, bartering for her sister's life. But she is betrayed and turned away empty-handed, incandescent with rage. Unknown to Leng, Pendergast’s brother, Diogenes, appears unexpectedly, offering to help --- for mysterious reasons of his own. Disguised as a cleric, Diogenes establishes himself in New York's notorious Five Points slum, manipulating events like a chess master, watching Leng’s every move…and awaiting his own chance to strike. Meanwhile, as Pendergast focuses on saving the unstable Constance in her fanatical quest for vengeance, she strikes out on her own: to rescue her beloved siblings from a tragic fate and take savage retribution on Leng. But Leng is one step ahead and has a surprise for them all.

In 2008, nine mountaineers failed to return from a winter backpacking trip in the New Mexico mountains. At their final campsite, searchers found a bizarre scene: something had appeared at the door of their tent so terrifying that it impelled them to slash their way out and flee barefoot to certain death in a blizzard. Despite a diligent search, only six bodies were found, two violently crushed and inexplicably missing their eyes. The case, given the code name “Dead Mountain” by the FBI, was never solved. Now, two more bodies from the lost expedition are unexpectedly discovered in a cave, one a grisly suicide. Young FBI Agent Corrie Swanson teams up with archaeologist Nora Kelly to investigate what really happened on that fateful trip 15 years ago --- and to find the ninth victim.

Astoundingly, Constance Greene has found a way back to the place of her origins, New York City in the late 1800s, leaping at the chance, although it means leaving the present forever. Constance sets off on a quest to prevent the events that lead to the deaths of her sister and brother. But along the road to redemption, Manhattan’s most infamous serial killer, Dr. Enoch Leng, lies in wait, ready to strike at the slightest provocation. Meanwhile, in contemporary New York, FBI Special Agent Pendergast feverishly searches for a way to reunite with Constance. But will he discover a way back to her before it’s too late?

Like millions of people around the world, Jeremy Logan (famed enigmalogist, or investigator of unexplained things) has grown to rely on his incredible new tech device. Made by Chrysalis, the global multibillion-dollar tech company, the small optical device connects people in a stunning new way, tapping into virtual reality for the first time on a wide scale. And yet, when Logan is summoned by Chrysalis to investigate a disturbing anomaly in the massive new product rollout, Logan is shocked to see the true scope of the massive company. He also quickly realizes that something in Chrysalis’s technology is very wrong and could be potentially devastating. The question is what, and where, is the danger coming from?

Lucas Tappan, a wealthy and eccentric billionaire and founder of Icarus Space Systems, approaches the Santa Fe Archaeological Institute with an outlandish proposal --- to finance a careful, scientific excavation of the Roswell Incident site, where a UFO is alleged to have crashed in 1947. A skeptical Nora Kelly is tasked with the job. Nora's excavation immediately uncovers two murder victims buried at the site, faces and hands obliterated with acid to erase their identities. Special Agent Corrie Swanson is assigned to the case. As Nora’s excavation proceeds, uncovering things both bizarre and seemingly inexplicable, Corrie’s homicide investigation throws open a Pandora's box of espionage and violence.

On the evening of November 24, 1971, D. B. Cooper hijacked Flight 305 with a fake bomb, collected a ransom of $200,000, and then parachuted from the rear of the plane, disappearing into the night…and into history. Fifty years later, Agent Pendergast takes on a bizarre and gruesome case: in the ghost-haunted city of Savannah, Georgia, bodies are found with no blood left in their veins --- sowing panic and reviving whispered tales of the infamous Savannah Vampire. As the mystery rises along with the body count, Pendergast and his partner, Agent Coldmoon, race to understand how --- or if --- these murders are connected to the only unsolved skyjacking in American history.

A mummified corpse is found in the cellar of an abandoned building in a remote New Mexico ghost town. Rookie FBI Agent Corrie Swanson is assigned to ID the body and determine the cause of death. She brings archaeologist Nora Kelly to excavate the body and lend her expertise to the investigation, and together they uncover something unexpected and shocking: the deceased apparently died in agony, in a fetal position, skin coming off in sheets, with a rictus of horror frozen on his face. Hidden on the corpse lies a 16th-century Spanish gold cross of immense value. When at last they identify the body --- and the bizarre cause of death --- Corrie and Nora open a door into a terrifying, secret world of ancient treasure and modern obsession.

Appearing out of nowhere to horrify the quiet resort town of Sanibel Island, Florida, dozens of identical, ordinary-looking shoes float in on the tide and are washed up on the tropical beach --- each one with a crudely severed human foot inside. In short order, Agent Pendergast finds himself facing the most complex and inexplicable challenge of his career: a tangled thread of evidence that spans seas and traverses continents, connected to one of the most baffling mysteries in modern medical science. Through shocking twists and turns, all trails lead back to a powerful adversary with a sadistic agenda and who --- in a cruel irony --- ultimately sees in Pendergast the ideal subject for their malevolent research.

Young curator Nora Kelly is approached by historian Clive Benton with a once-in-a-lifetime proposal: to lead a team in search of the so-called "Lost Camp" of the tragic Donner Party. This was a group of pioneers who became snow-bound in the California mountains in 1847, their fate unknown until the first skeletonized survivors stumbled out of the wilderness, raving about starvation, murder --- and cannibalism. Benton tells Kelly he has come across an amazing find: the long-sought diary of one of the victims, which has an enigmatic description of the Lost Camp. Nora agrees to lead an expedition to locate and excavate it. But as they uncover old bones, they expose the real truth of what happened, one that is far more shocking and bizarre than mere cannibalism.

A. X. L. Pendergast and his new colleague, junior agent Coldmoon, are assigned to investigate a rash of killings in Miami Beach, where a bloodthirsty psychopath is cutting out the hearts of his victims and leaving them with cryptic handwritten letters at local gravestones. The graves are unconnected save in one bizarre way: all belong to women who committed suicide. But the seeming lack of connection between the old suicides and the new murders is soon the least of Pendergast's worries. Because as he digs deeper, he realizes that the brutal new crimes may be just the tip of the iceberg: a conspiracy of death that reaches back decades.

Gideon Crew --- brilliant scientist, master thief, intrepid adventurer --- is shocked when his former employer, Eli Glinn, vanishes without a trace, and Glinn's high-tech lab Effective Engineering Solutions shuts down seemingly overnight. Fresh off a diagnosis that gives him only months to live, Crew is contacted by one of his former coworkers at EES, Manuel Garza, who has a bead on one final treasure hinted at in EES's final case, the long-awaited translation of a centuries-old stone tablet of a previously undiscovered civilization: The Phaistos Disc. What lies at the end of the trail will either save Gideon's life or bring it to a sudden, shocking close.

It begins as a manhunt for Grace Ozmian, the missing daughter of a wealthy tech billionaire. At first, the NYPD assumes that Grace has simply sped off on another wild adventure. But the case becomes something altogether different when the young woman's body is discovered, the head nowhere to be found. Lieutenant CDS Vincent D'Agosta quickly takes the lead. He knows his investigation will attract fierce scrutiny, so D'Agosta is delighted when FBI Special Agent A.X.L. Pendergast shows up at the crime scene also assigned to the case. But neither are prepared for what lies ahead, as it quickly becomes clear that a diabolical presence is haunting the greater metropolitan area.

When renowned "enigmalogist" Jeremy Logan travels to an isolated writers' retreat deep in the Adirondacks to work on his book, he discovers the remote community has been rocked by the grisly death of a hiker on Desolation Mountain. The attack occurred during the full moon and the body was severely mauled, but the unusual savagery calls into question the initial suspicions of a bear attack. Logan's theories take a dramatic turn when he meets Laura Feverbridge, a respected scientist who is still struggling with the violent loss of her father months earlier. As Feverbridge shares her research with Logan, he begins to wonder whether he is actually up against something he can’t believe is real.

After a harrowing, otherworldly confrontation on the shores of Exmouth, Massachusetts, Special Agent A.X.L. Pendergast is missing, presumed dead. Sick with grief, Pendergast's ward, Constance, retreats to her chambers beneath the family mansion at 891 Riverside Drive --- only to be taken captive by a shadowy figure from the past. Proctor, Pendergast's longtime bodyguard, springs to action, chasing Constance's kidnapper through cities, across oceans, and into wastelands unknown. And by the time Proctor discovers the truth, a terrifying engine has stirred --- and it may already be too late.

Five years ago, the mysterious and inscrutable head of Effective Engineering Solutions, Eli Glinn, led a mission to recover a gigantic meteorite from a remote island off the coast of South America. The mission ended in disaster when their ship foundered in a vicious storm and broke apart, sinking to the ocean floor. The tragedy revealed something truly terrifying: the meteorite they tried to retrieve was not simply a rock. Instead, it was a complex organism from the deep reaches of space. That organism has now implanted itself in the sea bed two miles below the surface --- and it’s growing. As Gideon Crew and his colleagues soon discover, the "meteorite" has a mind of its own and has no intention of going quietly.

Special Agent A.X.L. Pendergast, together with his ward Constance Greene, travels to the quaint seaside village of Exmouth, Massachusetts, to investigate the theft of a priceless wine collection. But inside the wine cellar, they find something considerably more disturbing: a bricked-up niche that once held a crumbling skeleton. Pendergast and Constance soon learn that Exmouth is a town with a very dark and troubled history, and this skeleton may be only the first hint of an ancient transgression, kept secret all these years. But they will discover that the sins of the past are still very much alive.

On a sprawling estate on the coast of Rhode Island, at the nation’s oldest and most prestigious think tank, an unfathomable tragedy takes place. No one knows what to make of the disturbing evidence left behind. Then reports begin to surface of increasingly bizarre behavior among the organization’s distinguished scientists. Called upon to investigate these strange happenings, history professor and analyst of inexplicable phenomena Jeremy Logan comes across an ingeniously concealed room in a long-dormant wing of the mansion. What he discovers within may provide answers --- and, in the process, unleash a new wave of catastrophe.

A long-buried family secret resurfaces when one of Special Agent Aloysius Pendergast's most feared enemies shows up on his doorstep as a murdered corpse with a piece of turquoise lodged in the stomach. The gem leads Pendergast to an abandoned mine on the shore of California's desolate Salton Sea. But Pendergast learns there is more at work than a ghastly episode of family history: he is soon stalked by a killer bent on vengeance over an ancient transgression.

Gideon Crew is living on borrowed time. When his mysterious employer gives him an eyebrow-raising mission, he has no reason to refuse. His task: steal a page from the priceless Book of Kells. Gideon accomplishes the impossible --- only to learn that hidden beneath the gorgeously illuminated image is a treasure map dating back to the time of the ancient Greeks. The treasure to which it leads is no ordinary fortune. It is something far more precious: an amazing discovery that could perhaps even save Gideon's life.

Special Agent Pendergast’s arrival at an exclusive Colorado ski resort to rescue his protégée, Corrie Swanson, from serious trouble with the law coincides with the first attack of a murderous arsonist who begins burning down mansions with the families locked inside. Eventually, he uncovers a mysterious connection between several miners who were killed 150 years earlier and a fabled, long-lost Sherlock Holmes story --- one that might just offer the key to the modern-day killings as well.

For 12 years, he believed she died in an accident. Then, he was told she’d been murdered. Now, FBI Special Agent Aloysius Pendergast discovers that his beloved wife Helen is alive. But their reunion is cut short when Helen is brazenly abducted before his eyes. Pendergast is forced to embark on a furious cross-country chase to rescue --- but what he finds is the origin of a nefarious international plot that he is unwittingly at the heart of.

Professor Jeremy Logan --- renowned investigator of the strange and the inexplicable --- is called to an excavation set in a nearly impenetrable Egyptian swamp. The treasure that lies beneath allegedly bears a curse that threatens the lives of all who attempt to unearth it, and Logan is there to help debunk the supernatural events that seem to be happening with increasing frequency.

Sifting through the evidence, authorities determine that in 10 days, a major American city will be vaporized by a terrorist attack. And Gideon Crew, tracking the mysterious terrorist cell, learns the end may be something far worse than mere Armageddon. 

A hunting trip for Pendergast and his brother-in-law, Judson Esterhazy, turns into a violent clash, in which Pendergast is left for dead.

Ever since his late mother begged him to avenge his father’s murder, Gideon Crew has been on a mission. Now, he is being closely observed --- and he may have an opportunity to use his skills for more than just this murder…