Something mysterious is killing the wildlife in the mountains just south of Tucson. When a college intern turned activist sets out to collect her own evidence, she, too, ends up dead. Local law enforcement is slow to get involved. That’s when the mobile FBI unit goes undercover to infiltrate the town and its copper refinery in search of possible leads. Quinn and Costa find themselves scouring the desolate landscape, which keeps revealing clues to something much darker - greed, child trafficking, and more death. 

FBI Agent Lucy Kincaid is dead-set on solving a cold case - even if the original investigators stonewall her every step of the way. A violent storm has uncovered the remains of a family that authorities assumed fled the country years ago to avoid prosecution. But the body of the youngest Albright son never turned up. If the child is dead, why wasn’t his body found with his parents? If he’s alive, where has he been...and what does he know? Now, Lucy and her partner, Nate, must reconstruct an old crime to find a missing child in the present day.

FBI Special Agent Kimberly Quincy and Sergeant Detective D. D. Warren have built a task force to follow the digital bread crumbs left behind by deceased serial kidnapper Jacob Ness. When a disturbing piece of evidence is discovered in the hills of Georgia, they bring Flora Dane and true-crime savant Keith Edgar to a small town where something seems to be deeply wrong.  

Six years ago, Lucy Kincaid was attacked and nearly killed by an online predator. She survived. Her attacker did not. Now Lucy’s goal is to join the FBI and fight cyber-crime, but in the meantime, she’s volunteering with a victim’s rights group, surfing the Web undercover to lure sex offenders into the hands of the law. But when the predators she hunts start turning up as murder victims, the FBI takes a whole new interest in Lucy.

Frankie Elkin is an average middle-aged woman, a recovering alcoholic with more regrets than belongings. But she spends her life doing what no one else will - searching for missing people the world has stopped looking for. When the police have given up, when the public no longer remembers, when the media has never paid attention, Frankie starts looking. A new case brings her to Mattapan, a Boston neighborhood with a rough reputation. She is searching for Angelique Badeau, a Haitian teenager who vanished from her high school months earlier. 

Michael Rowland is not your typical teenager. Deaf from birth, he’s always looked out for his five-year-old brother, Joshua. When his stepfather comes after Joshua, Michael takes the child and runs. He’s determined to protect his brother at all costs, even if that means making himself vulnerable to a danger he can’t hear coming. And the danger intensifies when Michael witnesses a stranger kill his stepfather.

When 12-year-old Holly Mitchell’s fragile little body is found on the steps of a mountainside church in the small town of Denton, a doll made from pine cones clasped tightly to her chest, Detective Josie Quinn rushes to attend the scene. She knows this little girl’s angelic face; her mother had offered Josie help when she’d needed it most. Searching the girl’s house, Josie is devastated to find that Holly’s mother is dead, too, and her little sister is missing. 

Two years ago, FBI Agent Lucy Kincaid put psychopath Elise Hansen Hunt in juvenile detention for her role in an organized crime syndicate. Now eighteen, Elise has been released with a clean slate, and plans to take her revenge by making Lucy's life hell. The plot begins with Lucy's husband Sean Rogan, who has been arrested for a murder he most certainly did not commit. Lucy is determined to prove Sean's innocence, but is warned off the case by her boss.  

Seventeen years ago. That was the last time Mercy Callahan saw Ephraim Burton, the leader of the twisted Eden cult where she was raised. But even though she escaped the abuse and terror, they continue to haunt her. When her brother Gideon discovers new evidence of the cult's - and their victims' - whereabouts, Mercy goes to Sacramento to reconnect with him. There, she meets Gideon's closest friend - homicide detective Rafe Sokolov. From Rafe, she receives an offer she never knew she needed: to track down Ephraim and make him pay for everything.

Twenty years ago Emily Mills's father was murdered, and she found his body hanging in the backyard. Her younger sister, Madison, claims she was asleep in her room. Her older sister, Tara, claims she was out with friends. The tragedy drove their mother to suicide and Tara to leave town forever. The killer was caught. The case closed. Ever since, Emily and Madison have tried to forget what happened that night - until an eerily similar murder brings it all back. 

For more than twenty-five years, Philadelphia homicide detective Bree Taggert has tucked away the nightmarish childhood memories of her parents’ murder-suicide…. Until her younger sister, Erin, is killed in a crime that echoes that tragic night: innocent witnesses and a stormy marriage that ended in gunfire. There’s just one chilling difference. Erin’s husband, Justin, has vanished.

Twenty years ago in the dead of night, four seemingly random individuals pulled the ultimate heist and almost walked away with half a million dollars. But by daybreak, their plan had been shot to hell. One of them was in the hospital. One was in jail. One was dead. And one got away with it. Arden Maxwell, the daughter of the man who disappeared all those years ago - presumably with the money, after murdering his accomplice - has never reconciled with her father's abandonment of her and her sister. 

When a park ranger stumbles across the bodies of Valerie and Tyler Yates by a creek in the small town of Denton, Detective Josie Quinn is first on the scene. Still reeling from the news that her abusive mother is dying, Josie suspects this is more than just accidental poisoning, and she’s right: Someone jammed a crudely carved pendant necklace down Valerie’s throat before she died. Combing the area, Josie’s team discover a third sleeping bag indicating there could have been an extra guest around the fire that night. A lucky escape? A missing victim? Or a suspect on the run?

When 17-year-old Savannah Devenish vanishes from her family’s remote vacation cabin in Minnesota, FBI Agent Tori Hunter races along treacherous icy roads to be first on the scene. Savannah’s parents are frantic with worry for their beautiful, carefree girl. Haunted by memories of her own missing sister, Tori vows to do whatever it takes to reunite this family. When the police uncover that Savannah’s father, Jacob, was having an affair, they suspect his involvement, but Tori is convinced his despair is genuine.

Appearing out of nowhere to horrify the quiet resort town of Sanibel Island, Florida, dozens of identical, ordinary-looking shoes float in on the tide and are washed up on the tropical beach - each one with a crudely severed human foot inside. Called away from vacation elsewhere in the state, Agent Pendergast reluctantly agrees to visit the crime scene - and, despite himself, is quickly drawn in by the incomprehensible puzzle. An early pathology report only adds to the mystery.