When Amber Young, a quiet, brilliant newspaper puzzle editor, detects a hidden cypher, she realizes a serial killer is leaving clues hidden in plain sight. The FBI’s BAU unit needs Amber’s unique genius to help them decode the mystery and catch a killer before it’s too late, and in this propulsive cat-and-mouse thriller, it’s a battle of clues, riddles, twists—and genius.

When a new serial killer strikes, the FBI, stumped, turns to its brilliant forensic examiner and entomologist, Fiona Red, with her unparalleled genius and ability to offer insights at crime scenes based on her insect expertise. When another victim turns up in a stretch of rural woods covered in unusual bugs, Fiona knows right away that something doesn’t add up. In this master game of wits, Fiona may have finally met her match.

In the darkness of a cold December morning, Detective Kim Stone steps through the doors of Halesowen Police Station. She’s about to meet her team for the first time. When the body of a young man is found beheaded and staked to the ground in a secluded area of the Clent Hills, Kim and her new squad rush to the crime scene. This audio edition includes exclusive bonus content.

In the remote forests of Stillwater, Minnesota, you can scream for days and no one will hear you. So when the bodies of two 15-year-old girls are discovered frozen in the snow, Special Agent Nikki Hunt is sure the killer is local: Someone knew where to hide the girls and thought they would never be found. Though Nikki hasn’t been home in 20 years, she knows she must take over the case.

A young woman is brutally attacked on her way home. It looks like she was the victim of a jilted—and twisted—ex-lover. But then two more women, also engaged to be married, are found dead. The press call the killer the "Surrey Stalker". And there’s a stack of similar cold case files. The pressure is on for young, ambitious DI Rob Miller. But with all the time he’s spending at the office, Rob’s also running a fine line trying to keep his fiancée, Yvette, onside as they try to plan their wedding.