Detective Winter Labey is called to a historic German bunker abandoned after the occupation of the island of Jersey, where tourists have discovered the concealed body of a prominent local figure. Was the execution-style murder connected to the Nazi graffiti daubed on the walls of his tomb?

Winter calls on forensic psychologist Saskia Monet, whose own childhood gives her a unique understanding of the darkest recesses of the human mind.

As Saskia and Winter delve into the case, they unravel a web of secrets the victim had desperately tried to keep hidden from his family. Secrets that, once exposed, could shatter the lives of those closest to him.

Just as they make a major breakthrough, there’s another murder in chillingly similar circumstances. Except now, it’s one of their suspects. Time is quickly running out to catch the killer before they strike again…