FBI Special Agent Taylor Sage has crossed the country and transferred to her dream job with the BAU at Quantico. With a new job, a new house, and her husband by her side, Taylor is ready to put the darkness of her past behind her: a sister who vanished when she was a teenager.

FBI Special Agent Katie Winter is no stranger to frigid winters, isolation, and dangerous cases. With her sterling record of hunting down serial killers, she is a fast-rising star in the BAU, and when a woman is discovered in the middle of a frozen lake, Katie is the natural choice to partner with Canadian law enforcement to track the killer across the brutal and unforgiving landscape.

Five years ago, DCI John Lomond led the search for notorious Glasgow child-killer ‘The Sandman', until personal tragedy forced him off the case. In Lomond's absence, the killer was never found. Now, with nothing but work left in his life, Lomond remains obsessed with the case–despite the nightmares it brings. When a child is abducted in similar Sandman fashion from an affluent Glasgow suburb, Lomond is brought in to find them before it's too late.

FBI Special Agent Maya Gray, 39, has seen it all. She’s one of BAU’s rising stars and the go-to agent for hard-to-crack serial cases. When she receives a handwritten postcard promising to release 12 kidnapped women if she will solve 12 cold cases, she assumes it’s a hoax.

The survivor of a new serial killer remembers but one harrowing detail: his eerie voice. With only this strange clue—and an equally perplexing lead from the tarot reader—FBI agent Taylor Sage must race to stop this murderer before he leaves another body in his wake.

A notorious stretch of highway is rife with serial killers, unsolved murders and missing-persons cases. The FBI, knowing it must crack this Bermuda Triangle of death, assigns its most brilliant mind—and flawed agent—Rylie Wolf, to dive headfirst into this road of danger. Rylie must tap her brilliant instincts to decode these cases and enter the twisted mind of killers—while battling demons from her own dark past.

FBI Special Agent Ruby Hunter wants nothing more than to put the 13 killer, and her days in the FBI, behind her, and to try to pick up the pieces of her life. But he refuses to rot quietly. Ruby realizes she must do the thing she dreads the most: Visit him in prison. But he is diabolical and cunning, an expert at toying with his victims—and with her.

FBI Special Agent Claire King dies chasing a killer—and is resuscitated minutes later to realize she has changed. Dark images flash through her mind in a newfound power, visions leading her towards serial killers. But the riddles that plague her are obscured and conflicting, and Claire soon realizes that they may lead her to crack a case—or may just put her in the crosshairs of a killer.

Harley, reeling from her being put on leave, from her long-term relationship falling apart, and from her father’s dying, is hardly ready to return to her hometown, to its long-buried secrets, and her tortured past. She spent her life escaping this small town—but, as she settles back in, she wonders: Might she have been wrong all this time? Yet as more bodies surface and as every clue leads to a dead end, Harley, clashing with her new partner, realizes she’s in a race against time.

In a small harbor town in Maine, police officer Reese Link’s first day on the force begins with a bang: the first homicide this town has seen in years. Reese hopes to step into her dead brother’s shoes, but with her newly assigned partner having just shot himself and a diabolical killer on the loose, Reese wonders: does she have what it takes to outwit him—and to save another life?