June Moody is a 30-something English professor. Her old friend and longtime nemesis Sadie MacTavish, a mega-successful author, invites June and her college friends to a baby shower at her sprawling estate in the San Juan Islands. June is less than thrilled to spend time with Sadie and her husband - June's former crush - but agrees to go. The party gets off to a shaky start when old grudges resurface, but when they wake the next morning, they find something worse: Sadie is missing, the house is in shambles, and bloodstains mar the staircase.

Steppy Corner, voice of true crime podcast series All the Dark Corners, wakes in hospital with no memory of what brought her to Heartsick - the small Colorado town where her estranged family live - no memory of why she was racing up the mountainside to her parents' house late at night . . . or why she didn't make that bend. All she knows is her mother has been brutally murdered and her brother is the prime suspect. As Steppy begins to piece together events in the run-up to the accident, she discovers her brother's connection to another ongoing case, that of a missing girl last seen with him.

A known serial killer is once again taking lives in Chicago. Bodies drained of blood are being strewn across the city. For former Tampa homicide sergeant, Hank Rawlings, tracking down the man responsible for the killings becomes his first assignment at his new position, agent in the FBI's homicide division of the serial crimes unit. Almost before the ink dries on the new job's acceptance papers, Hank finds himself in Chicago, knee-deep in an investigation with a mounting body count.

Brooklyn Sloane works as a special consultant to the FBI as one of the most adept profilers in the agency's history. She had been recruited at a relatively young age from her career in academics, but her colleagues have no idea the disturbing motive for her success.

Ryan Wilkins grew up on a trailer park, a member of what many people would call the criminal classes. As a young Detective Inspector, he's lost none of his disgust with privileged elites - or his objectionable manners. But he notices things; they stick to his eyes. His professional partner, DI Ray Wilkins, of affluent Nigerian London heritage, is an impeccably groomed, smooth-talking graduate of Balliol College, Oxford. You wouldn't think they would get on. They don't. But when a young woman is found strangled at Barnabas Hall, they're forced to.