There is already a neat trench in the narrow gap between the tall cliffs. Nelson looks at it with pleasure . . . Then he looks closer. The trench appears to be full of bones.

Elly Griffiths’s Ruth Galloway novels have been praised as “highly atmospheric” (New York Times Book Review) and “remarkable” (Richmond Times-Dispatch). Now the beloved forensic archeologist returns, called in to investigate when human bones surface on a remote Norfolk beach.

Just back from maternity leave, Ruth is finding it difficult to juggle motherhood and work. The presence of DCI Harry Nelson—the married father of her daughter, Kate—does not help. The bones, skeletons of six men with their arms bound, turn out to be about seventy years old, which leads Nelson and Ruth to the war years, a desperate time on this stretch of coastland. Home Guard veteran Archie Whitcliffe reveals the existence of a secret the old soldiers have vowed to protect with their lives. But then Archie is killed and a German journalist arrives, asking questions about Operation Lucifer, a plan to stop a German invasion, and a possible British war crime. What was Operation Lucifer? And who is prepared to kill to keep its secret?