From #1 New York Times bestselling author Meg Gardiner comes a new high-octane thriller in the acclaimed UNSUB series.

FBI Special Agent Caitlin Hendrix faces a case from nightmares.

In a Tennessee prison, Efrem Judah Goode draws haunting portraits of women he claims he has killed. Around the country, desperate families of the missing seek answers in his eerie drawings. And on darkened back roads and New York City streets, a new killer poses duct-taped bodies at the sites of Goode's murders.

Two serial killers are locked in a twisted rivalry. To stop the brutal slayings, FBI profiler Caitlin Hendrix must unravel the connection between Goode and the Broken Heart Killer. Their warped competition destroys anyone in their path. Caught between a manipulative psychopath and a ruthless UNSUB, Caitlin has to dive into not one, but two dark and twisted minds. She will risk everything, plunging into the depths of their depraved clash to hunt down an unstoppable killer.