FBI super-profiler Agent Meredeth Connelly begins her hunt for The .40 Caliber Killer. She collects evidence. He collects families. Her headaches become more unbearable with each crime scene, with each dead child. With two decades of experience, she knows serial killers. As the body count rises, it’s clear that this serial killer knows her. She doesn't remember him. He'll never forget her. As the investigation progresses, something awakens within her that hints at an answer.

Renowned criminal psychologist Bridget Bishop quit the FBI’s Behavioral Analysis Unit after only two years on the job, exhausted and traumatized from facilitating the investigation and capture of one of the country’s most prolific serial killers.

Twenty years ago Ed Finch – America’s most notorious serial killer – used the Bay Area as his hunting ground. Now, his daughter Margot is a homicide detective with the San Francisco Police Department who has spent her whole life trying to forget who she is. But her daddy won’t let her forget. When Margot receives a phone call from his lawyer, she learns that Ed is back – transferred to death row at San Quentin. And her father has a message for her: he’s willing to disclose some long-held secrets. But there’s a catch. She has to visit him.

When a world-renowned psychiatrist is found dead in an abandoned ranch house in the Californian Santa Carina Valley, a Post-it note with the words “Susan Parker” and a cell phone number is taped to the basement door. Still grieving her husband’s devastating suicide less than a year ago, FBI agent Susan Parker is taking a break from work and trying to rebuild her life as a single mom to her seven-year-old daughter, Natalie. When she’s called to the crime scene of Doctor Magnusson, a chill runs down her spine.

While investigating Blackston’s recent activities, FBI Agent Jeremy Winter stumbles upon a string of missing persons within state parks. Unable to convince his boss that Blackston’s disappearance is anything other than a lost hiker, Winter joins forces with a local police officer to continue the search. As the clues mount, a dark figure from Jeremy’s past emerges with an ultimatum - one that could force him out of the bureau. Afraid that his girlfriend, fellow agent Maggie Keeley, will be dragged into a high-stakes political game, he delays his decision.

When Detective Maria Miller walks up creaking stairs into the attic of the old brownstone she senses this isn’t an ordinary crime scene. The brutality of the murder is enough to shock even an experienced detective like Maria. But there’s something else. An unsettling presence seems to lurk in the shadows sending a chill through Maria’s bones, making her desperate to run back down the stairs and never return. The killing is identical to the murder of an actress sixty years before, a crime that tore a family apart and sent shockwaves through New York City.

Women are being found dead, contorted, and raped as the Pike Peaks Killer makes headlines. With Detective Frost's abilities doubted, and no new leads on the case, FBI Agent Jaxson Locke arrives uninvited to help with the investigation.

FBI Agent Jo Pullinger arrives in Seattle, Washington. She is grateful to leave behind her old life. One that involved having a transplant of a killer’s heart. When a wealthy family is murdered in their mansion, the daughter’s boyfriend is taken into custody. He was found at the scene of the crime, cradling the daughter’s body, with the murder weapon at his side. Jo’s instincts tell her the boyfriend is not guilty, even though, all the evidence is stacked against him.

FBI Special Agent Emily Slate is no stranger to tragedy. After losing her husband three months ago, then botching the biggest case of her career, she’s barely escaped a full suspension. Determined to get her life back on track or die trying, she takes a seemingly impossible case in hopes she can turn her fortunes around.

When a teenage girl is found dead in the woods, her body posed like an angel, Stockholm holds its breath. The kill bears a chilling resemblance to those of the Angel Maker, a serial killer caught two decades ago.... One who just died in prison. Detective Inspector Jamie Johansson is taking some much-needed time away from the London Met when the call comes in. Her father, one of Stockholm's most notorious detectives, caught the Angel Maker when she was just a girl, and Jamie has long since closed the door to that part of her life.