Five years ago, when Detective Jena Campbell put the Leviticus Killer behind bars, she locked her darkest secret away with him. Something never meant to surface. Something better left to rot with the madman who had destroyed so many lives. When a strange man calling himself Azrael appears on social media with threats to unleash 10 plagues and 10 deaths in 10 days unless Leviticus is released, Jena is forced to reopen that door and face her past. Unable to share what she knows, she turns to the only man who can help her find Azrael before he kills again, the man she condemned. Jena quickly learns that the only thing more terrifying than facing him is facing herself.

Hollows Bend, New Hampshire, is a picture-perfect New England town where weekend tourists flock to see fall leaves and eat breakfast at the Stairway Diner. The crime rate --- zero --- is a point of pride for Sheriff Ellie Pritchett. The day the stranger shows up is when the trouble starts. The sheriff and her deputy investigate the mysterious teenage girl. None of the locals can place her. She can’t --- or won’t --- answer any questions. She won’t even tell them her name. While the girl is in protective custody, the officers are called to multiple crime scenes leading them closer and closer to a lake outside of town that doesn’t appear on any map.

In the shadow of Mount Hood, 16-year-old Tennant is checking rabbit traps with her eight-year-old sister, Sophie, when the girls are suddenly overcome by a strange vibration rising out of the forest, building in intensity until it sounds like a deafening crescendo of screams. From out of nowhere, their father sweeps them up and drops them through a trapdoor into a storm cellar. But the sound only gets worse.

On his first night with the Detroit PD, Officer Walter O’Brien is called to a murder scene. A terrified 20-year-old has bludgeoned her kidnapper with skill that shocks even O’Brien’s veteran partner. The young woman is also a brilliant escape artist. Her bold flight from police custody makes the case impossible to solve --- and, for Walter, even more impossible to forget. By the time Walter is promoted to detective, his fascination with the missing, gray-eyed woman is approaching obsession. And when Walter discovers that he’s not alone in his search, one truth is certain. This deadly string of secrets didn’t begin in his home city --- but he’s going to make sure it ends there.

Michael and Megan Fitzgerald’s parents are public intellectuals, an Ivy League clinical psychologist and a renowned psychiatrist, and they brought up their adopted children in a rarefied, experimental environment. It forced secrets upon them that they keep at all costs. In Los Angeles, Detective Garrett Dobbs and FBI Agent Jessica Gimble have joined forces to work a murder that seems like a dead cinch. Their chief suspect is quickly identified and apprehended. But then there's another killing just like the one they've been investigating. And another. And not just in Los Angeles. The Fitzgerald family comes to the investigators' attention, but Dobbs and Gimble are at a loss. If one of the four is involved, which Fitzgerald might it be?

Controversial satellite radio talk show host Jordan Briggs has clawed her way to the top of the broadcast world. She doesn't hold back, doesn't spare feelings, and has no trouble sharing what's on her mind. Her rigorous pursuit of success has come at a price, though. Her marriage is in ruins, she hasn't spoken to her mother in years, and she's distanced herself from all those close to her. If not for her young daughter, Charlotte, her personal life would be in complete shambles. When a subdued man calls into the show and asks to play a game, she sees it as nothing more than a way to kick-start the morning. Against her producer's advice, she agrees, and unwittingly opens a door to the past. Live on the air with an audience of millions, what starts out as a game quickly turns deadly.

It is 1868, and a 21-year-old Bram Stoker waits in a desolate tower to face an indescribable evil. Armed only with crucifixes, holy water and a rifle, he prays to survive a single night. A sickly child, Bram spent his early days bedridden in his parents' Dublin home, tended to by his caretaker, a young woman named Ellen Crone. When a string of strange deaths occur in a nearby town, Bram and his sister Matilda detect a pattern of bizarre behavior by Ellen --- a mystery that deepens chillingly until Ellen vanishes suddenly from their lives. Years later, Matilda returns from studying in Paris to tell Bram the news that she has seen Ellen --- and that the nightmare they've thought long ended is only beginning.

Detective Porter and the team have been pulled from the hunt for Anson Bishop, the Four Monkey Killer, by the feds. When the body of a young girl is found beneath the frozen waters of Jackson Park Lagoon, she is identified as Ella Reynolds, missing three weeks. But how did she get there? The lagoon froze months earlier. More baffling? She’s found wearing the clothes of another girl, missing less than two days. Obsessed with catching Bishop, Porter follows a single grainy photograph from Chicago to the streets of New Orleans and stumbles into a world darker than he could have possibly imagined, where he quickly realizes that the only place more frightening than the mind of a serial killer is the mind of the mother from which he came.

For over five years, the Four Monkey Killer has terrorized the residents of Chicago. When his body is found, the police quickly realize he was on his way to deliver one final message, one that proves he has taken another victim who may still be alive. When Detective Sam Porter, the lead investigator on the 4MK task force, discovers a personal diary in the jacket pocket of the body, he finds himself caught up in the mind of a psychopath, unraveling a twisted history in hopes of finding one last girl, all while struggling with personal demons of his own. With only a handful of clues, the elusive killer’s identity remains a mystery. Time is running out, and the Four Monkey Killer taunts from beyond the grave.