Dr. Kendra Michaels, blind for the first 20 years of her life before gaining her sight via a revolutionary surgical procedure, is a renowned investigator known for her razor-sharp senses --- honed during her years in the dark --- and keen deductive abilities. Now her skills are needed uncomfortably close to home. Two staff members have been murdered at a school for the blind where Kendra spent her formative years. But the murders are puzzlingly dissimilar: one victim was brutally stabbed, while the other was killed by a bullet to the head. Are the crimes related? Or is Kendra on the hunt for more than one dangerous killer?

Kendra Michaels, formerly blind and now a hired gun for law enforcement agencies who relies on her razor-sharp powers of observation, is reluctant to help the FBI with the most recent case they’ve brought to her. But then she hears the details: the body was found just blocks away from Kendra’s condo. The young woman was carrying an envelope with Kendra’s name on it, and inside was an SD card with what appears to be an innocuous video of a wedding reception. The woman died trying to get the video to Kendra, but for what purpose? Before Kendra and the FBI can answer that question, the bride is abducted from her suburban home. And so the hunt is on for a killer whose nightmarish plan is slowly becoming clear.

A serial killer is on the loose in San Diego with a most unusual M.O. With each kill, the perpetrator leaves behind mystifying random objects. In this confusing array of unrelated evidence, the one thing that is clear is that the murders all have one characteristic in common: they all require the specific skills of Kendra Michaels, hired gun for both the CIA and FBI. Kendra, who was blind for the first 20 years of her life, gained her sight through a revolutionary surgical procedure and now uses her acute powers of observation to assist in cases all over the United States. FBI investigators soon make a startling discovery: the left-behind objects are actually souvenirs of other unsolved serial murder cases from around the country.

Born blind, Kendra Michaels spent the first 20 years of her life living in the darkness. Then, thanks to a revolutionary medical procedure developed by England’s Night Watch Project, she was given the gift of sight. Her highly developed senses (honed during her years in the dark), combined with her new found vision, have made her a remarkable investigator, sought after by law-enforcement agencies all over the country. But her newest case becomes deeply personal as she uncovers the truth about the shadowy organization that has given her so much.

Kendra Michaels was instrumental in bringing serial killer Eric Colby to justice. And yet, despite his apparent execution, Kendra is convinced that Colby is still alive. The problem is that she can't prove it. Even her razor-sharp powers of observation --- developed to an amazing capacity during the 20 years she spent blind and now in constant demand by law enforcement agencies --- have gotten her nowhere. But then a reporter who very publicly humiliated Kendra is murdered. Visiting the crime scene in search of anything that might link the brutal homicide to Colby, Kendra instead finds evidence that points to her.

Before the experimental surgery that gave her sight, Kendra Michaels developed her other senses to an amazing capacity. Law enforcement agencies clamor for her powers of perception and observation. When Kendra realizes that an apparent traffic accident on San Diego's historic Cabrillo Bridge is in fact a murder scene, she rushes to alert the police. As the body count rises, a gruesome pattern emerges. Someone is killing people in ways that mirror Kendra's most notorious cases…and he is not working alone.

The FBI doesn’t usually consult with music therapists, but Kendra Michael has perfected the art of picking up the most subtle audio, olfactory and tactile cues from the world around her. Former FBI agent Adam Kyle is a notorious master manipulator, skillfully handing criminals and colleagues alike. But now he needs Kendra’s help to find her ex, who may have run directly into the path of a serial killer.