Thirty-eight-year-old Rebecca Barlow drops her four-year-old son off at her parents' house, promising to return by five. Five comes and goes. Then six. Then seven. Worried, Rebecca's parents try calling. She doesn't answer, and her friends haven't heard from her either. It seems no one has. As concern mounts, Rebecca's father drives to the lake house where she's been staying. Rebecca is nowhere in sight. The following morning brings a grisly discovery when Rebecca's body is found floating in the lake.

Private Investigator Sloane Monroe is about to face the most challenging case of her life, and this time, it hits a little too close to home. In the dirty hallway of a local tavern, six-year-old Louie Alvarez plays with his race cars, waiting for his mother to take him home. A scream rips through the air. Louie freezes, then turns, staring at the room at the end of the hallway where the sound had come from.

Fed up with her lazy, unruly neighbor, Mary Pritchard sprints across the street, determined to give Darryl a piece of her mind. She arrives to find he's been shot, the bullet piercing the center of his forehead. He's been executed, and that's not all. A mysterious woman is sprawled out on the floor in Darryl's hallway. She's dead too. Who is the woman? Why is she there? And why have they both been murdered?

Eve Dallas is a New York police lieutenant hunting for a ruthless killer. In over ten years on the force, she’s seen it all - and knows her survival depends on her instincts. And she’s going against every warning telling her not to get involved with Roarke, an Irish billionaire - and a suspect in Eve’s murder investigation.

Feisty. Ballsy. Bold. And not your average 70-year-old woman. After a late-night tryst with a much younger man, Maisie Fezziwig wakes to a harrowing scream outside. Curious, she removes a pistol from her dresser drawer and walks outside to investigate. The sleepy street is still and calm at first, until Maisie stumbles on a grisly murder that will change her life forever.

Something unusual is happening to Quinn Montgomery. Trapped inside her unconscious mind, the sound of her father's soothing voice seeps through, and the past 24 hours come flooding back. She wakes to find herself in the hospital. Her childhood best friend Evie is dead. But not just dead, murdered, and Evie's four-year-old son witnessed it all. Traumatized over what he saw, he's not talking. And when Evie's cold-blooded killer goes into hiding, Quinn isn't only out for justice, she's out for revenge.

Anna McNichol knows how to take charge. Raised by a single mother, she’s worked to ensure her three children have every advantage she didn’t. And while her marriage has its problems, she values commitment and believes in "till death do us part." Now an empty nester, she’s at the peak of her career and ready to seize the opportunity to focus on her future.

Emerson Knight is introverted and eccentric and has little to no sense of social etiquette. Good thing he's also brilliant, rich, and (some people might say) handsome, or he'd probably be homeless. Riley Moon has just graduated from Harvard Business and Harvard Law. Her aggressive Texas spitfire attitude has helped her land her dream job as a junior analyst with megabank Blane-Grunwald. At least Riley Moon thought it was her dream job, until she is given her first assignment: babysitting Emerson Knight.

He slips into their homes at night and walks silently into bedrooms where women lie sleeping, unaware of the horrors they soon will endure. The precision of the killer's methods suggests he is a deranged man of medicine, propelling the Boston newspapers and the frightened public to name him "The Surgeon". The cops' only clue rests with another surgeon, the victim of a nearly identical crime. Two years ago, Dr. Catherine Cordell fought back and killed her attacker before he could complete his assault.

Sophia Moon had always been reticent about her life in Russia, and when she dies, suspiciously, on a wintry New York evening, Isobelle despairs that her mother's secrets have died with her. But while renovating the apartment they shared, Isobelle discovers something among her mother's effects - a stunning silver tiara, stripped of its jewels.

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.

On the outside, Cora Shields is a total badass. A Navy SEAL veteran and a top agent in the FBI’s Behavioral Analysis Unit, Cora has a reputation for doing whatever it takes to catch a killer. What no one knows, though, is that she’s a wreck on the inside, addicted to painkillers and deeply depressed. When Cora is fired, she is at loose ends—until she learns that an old friend’s daughter has disappeared.

Lei has overcome a scarred past to make a life for herself as a cop in the sleepy Big Island town of Hilo. On a routine patrol she finds two murdered teenagers - one of whom she'd recently busted. With its echoes of her own past, the murdered girl's harsh life and tragic death affect Lei deeply. She becomes obsessed - even as the killer is drawn to Lei's intensity, feeding off her vulnerabilities and toying with her sanity.

When Gemma Kline is reported missing after setting off on a solo hike in the remote Pennines, her sister, Sarah, is dumbfounded. How can someone disappear without a trace? Travelling to the isolated town where Gemma was last seen, Sarah discovers it’s not the first time a young woman has vanished from the hills in mysterious circumstances. As she digs deeper, it quickly becomes apparent that neither disappearance is what it first seems – especially when unwelcoming locals share chilling tales about what’s really lurking on the moors.

Leah’s perfect marriage isn’t what it seems, but the biggest lie of all is that she’s learned to live with what happened all those years ago. Marie drinks a bit too much to help her forget. And Carly has never forgiven herself for not keeping them safe.