Just back from maternity leave, forensic archeologist Ruth is finding it hard to juggle motherhood and work when she is called in to investigate human bones that have surfaced on a remote Norfolk beach. The presence of DCI Harry Nelson, the married father of her daughter, does not help. The bones, six men with their arms bound, turn out to date back to World War II, a desperate time on this stretch of coastland. As Ruth and Nelson investigate, Home Guard veteran Archie Whitcliffe reveals the existence of a secret the old soldiers have vowed to protect with their lives.

Forensic archeologist Ruth Galloway is in her late thirties. She lives happily alone with her cats in a remote area near Norfolk, land that was sacred to its Iron Age inhabitants—not quite earth, not quite sea. But her routine is harshly upended when a child’s bones are found on a desolate beach. Detective Chief Inspector Nelson calls Ruth for help, believing the bones to be the remains of Lucy Downey, a little girl who went missing a decade ago and whose abductor taunts him with bizarre letters referencing ritual sacrifice, Shakespeare, and the Bible.

When a child’s remains are found at a demolition site—a former children’s home in Norwich—forensic archaeologist Ruth Galloway is called in to examine the bones. She quickly notes that the skull is missing. Is this a Roman-era ritual sacrifice, or is the killer closer at hand? Ruth and DCI Nelson seek out the priest who served as the home’s operator. Father Hennessey reports that two children had gone missing there, about forty years earlier. They were never found. Is this one of them, finally unearthed?

Clare Cassidy is no stranger to murder. A high school English teacher specializing in the Gothic writer R. M. Holland, she teaches a course on it every year. But when one of Clare’s colleagues and closest friends is found dead, with a line from R. M. Holland’s most famous story, “The Stranger”, left by her body, Clare is horrified to see her life collide with the story lines of her favorite literature.

Ali Dawson and her cold case team investigate crimes so old, they're frozen—or so their inside joke goes. Ali’s work seems like a safe desk job, but what her friends—and even her beloved son—don’t know is that her team has a secret: they can travel back in time to look for evidence. So far, Ali has only made short trips to the recent past, so she’s surprised when she’s asked to investigate a murder in 1850. The killing has been pinned on an aristocratic patron of the arts and antiquities, and member of a sinister group called The Collectors.