When Agent Mercedes Ramirez finds an abused young boy on her porch, covered in blood and clutching a teddy bear, she has no idea that this is just the beginning. He tells her a chilling tale: an angel killed his parents and then brought him here so Mercedes could keep him safe. His parents weren’t just murdered. It was a slaughter - a rage kill like no one on the Crimes Against Children team had seen before. But they’re going to see it again. An avenging angel is meting out savage justice, and she’s far from through.

Near an isolated mansion lies a beautiful garden. In this garden grow luscious flowers, shady trees...and a collection of precious “butterflies” - young women who have been kidnapped and intricately tattooed to resemble their namesakes. Overseeing it all is the Gardener, a brutal, twisted man obsessed with capturing and preserving his lovely specimens.

Florida journalism undergrad Rebecca Sorley is like any other college student. She tries to keep up with her studies, her friends, and her hot-tempered roommate, Ellie, who regularly courts trouble with the law. When a male student's remains are found in alligator-infested waters, the university warns students to stay away from the reptiles. But then a second body shows up, and the link is undeniable. Both men belonged to the same fraternity and had a reputation for preying on and hurting women.

Four months after the explosion at the Garden, a place where young women known as the Butterflies were kept captive, FBI agents Brandon Eddison, Victor Hanoverian, and Mercedes Ramirez are still entrenched in the aftermath, helping survivors in the process of adjusting to life on the outside. With winter coming to an end, the Butterflies have longer, warmer days of healing ahead.

When 25-year-old Beth Mullen returns home, expecting to find her twin Rachel waiting for her, the silent house sends a shiver down her spine. She races upstairs to find her beautiful beloved sister cold in her childhood bed, her sparkling blue eyes closed forever, the morning after attending a glittering party.... Newly engaged Detective Lottie Parker knows that Rachel has been murdered the minute she enters the bedroom. Rachel’s neck is bruised and a shard of glass placed in her throat. Confronted with such a horrifying killing, Lottie wastes no time in pursuing every clue. 

For five friends, this was supposed to be one last getaway before going their separate ways - a chance to say good-bye to each other and to the game they've been playing for the past three years. But they're all dealing with their own demons, and they're all hiding secrets.   

Shopping with her sister, DI Amy Winter is admiring a Valentine’s Day window display of a perfect bride encrusted in diamonds and resplendent in lace - until she notices blood oozing from the mannequin’s mouth. This is no stunt. A post-mortem reveals the victim was left to die on her macabre throne for all to see. When a second victim is found, it emerges that both women were "Sugar Babes" arranging dates with older men online - and Amy finds herself hunting an accomplished psychopath.

Four-year-old Ellen is snatched by a stranger in the dead of night. Her devastated mother, Nicole, receives four identical phials and a threatening note in a familiar scrawl that chills her to the bone. But she always knew this would happen. She’s been expecting it for years. According to the note, one of the phials is poisoned. Nicole is given a deadly challenge: If she drinks one, the sadistic kidnapper will notify the police of Ellen’s location. The sender claims to be Luka Volkov, but Luka is supposed to be dead, killed long ago in a fire that haunts all those involved.

Homicide detective Elise Sandburg and her partner, profiler David Gould, are all too familiar with the terrible costs of chasing evil. Despite their wounded psyches, the detectives delve into the deranged killer's twisted mind, determined to unravel the clues in the taunts he leaves behind. When his daughter becomes the killer's next victim, a grief-stricken mayor comes down hard on the police, demanding that they catch the psychopath - now. Feeling the pressure, department officials enlist the aid of both Elise's estranged father and an FBI profiler who has unresolved business with David.

DI Amy Winter is hoping to follow in the footsteps of her highly respected police officer father. But when a letter arrives from the prison cell of Lillian Grimes, one half of a notorious husband-and-wife serial-killer team, it contains a revelation that will tear her life apart. Responsible for a string of heinous killings decades ago, Lillian is pure evil. A psychopathic murderer. And Amy’s biological mother. Now, she is ready to reveal the location of three of her victims - but only if Amy plays along with her twisted game.

Escaping from a madman should have been the end of her nightmare. Instead it was only the beginning...Lizzy Gardner was just seventeen when she was kidnapped by the psychopath known as Spiderman, a serial killer terrorizing her California hometown. Imprisoned and tormented for months, Lizzy narrowly escaped with her life and Spiderman vanished without a trace. But if she thought he would forget her, she was dead wrong.

Convicted serial killer Benjamin Fisher has finally offered to lead San Bernardino detective Daniel Ellis to the isolated graves of his victims. One catch: he'll only do it if FBI profiler Reni Fisher, his estranged daughter, accompanies them. As hard as it is to exhume her traumatic childhood, Reni can’t say no. She still feels complicit in her father’s crimes.

A boy’s frozen body is found trapped in the ice of a Minneapolis lake. The horrifying discovery leads Detective Jude Fontaine and her partner, Uriah Ashby, to more bodies in the ice, all of twelve-year-old boys missing for twenty years. Then, in one of the worst blizzards the city has ever seen, a four-year-old is abandoned on Jude’s doorstep. The child can’t tell them where he’s from, who his parents are, or how he got there. He doesn’t even know his name. But in his unspoken language, Jude reads something horrifying - a connection to the dead boys.

Twenty-one years ago, Carol Fullerton's car was found abandoned by the side of a California highway. The teenager hasn't been seen or heard from since, and the case has long since gone cold. Now Carol's mother is dying. But before she draws her last breath she wants to know, once and for all, exactly what happened to her daughter... Six months ago, Diane Kramer emptied her savings account and vanished. According to her sister, the only clue is her obsession with a charismatic weight-loss guru.

When she was 16 years old, Angela Wong - one of the most popular girls in school - disappeared without a trace. Nobody ever suspected that her best friend, Georgina Shaw, now an executive and rising star at her Seattle pharmaceutical company, was involved in any way. Certainly not Kaiser Brody, who was close with both girls back in high school. But 14 years later, Angela Wong's remains are discovered in the woods near Geo's childhood home.