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.

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. 

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.

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.  

Timothy O’Day knew the woods. Yet when he disappeared on the first night of a bachelor party camping trip with his best friends in the world, he didn’t leave a trace. What he did leave behind were two heartbroken parents, a crew of guilt-ridden groomsmen, and a pile of clues that don’t add up. Frankie Elkin doesn’t know the woods, but she knows how to find people. So when she reads that Timothy’s father is organizing one last search, she heads to Wyoming. 

A knock on the door late in the evening can only mean trouble for Detective Josie Quinn, but fear chokes her at the news that one of her own team is missing. No one has seen Denton PD’s Press Liaison Amber for days and, as she follows the message scrawled on the frosted windscreen of Amber’s car to a nearby dam, Josie hears a piercing scream that tells her she’s too late. But the body they pull from the freezing water is not Amber....

Assigned to San Antonio’s Violent Crimes unit, Lucy Kincaid joins a team of seasoned veterans and newer agents for a task force called Operation Heatwave. It’s supposed to be a simple sweep of known offenders with outstanding warrants. But when Lucy and her team try to bust two local brothers for jumping bail, she walks into a hotbed of pure evil. Their names are George and Jaime Sanchez. They are charged with murder, drug trafficking, and worse. And one of them is still out there.

On her first day back with the Denton PD after a major trauma, Detective Josie Quinn is on the hunt for a missing woman, Krystal Duncan, the mother of one of five children killed in a devastating school bus crash. Hours later, Josie finds Krystal’s body beside her daughter’s grave, her lips sealed together forever with wax.

Seven years ago, carefree college student Flora Dane was kidnapped while on spring break. For 472 days, Flora learned just how much one person can endure. Miraculously alive after her ordeal, Flora has spent the past five years reacquainting herself with the rhythms of normal life, working with her FBI victim advocate, Samuel Keynes. She has a mother who’s never stopped loving her, a brother who is scared of the person she’s become, and a bedroom wall covered with photos of other girls who’ve never made it home.

The body of a young girl lying face down in a swimming pool - white tennis shoes still on her feet, chestnut hair fanned out like a halo - is the last thing Detective Josie Quinn expects to find on an early morning visit to see her brother before class at Denton University. But when she recognizes the girl’s face as she drags her limp body from the water, there’s only one question racing through Josie’s mind: How does a champion swimmer accidentally drown?