Ever since his father disappeared when he was nine years old, Ian Kennedy has had a penchant for stories about missing people—and a knack for finding them. Now he's a private investigator with an impressive track record. But when a woman enters his London office and asks him to find her lost daughter, Ian faces a case he fears he cannot solve—and one he knows he must.

Laura Lensky's stunning twenty-one-year-old daughter, Peri, has been missing for over two years—a lifetime, under the circumstances. But when Ian learns the details of her disappearance, he discovers eerie parallels to an obscure Celtic myth—and to the haunting case that launched his career, an early success he's never fully been able to explain.

Though Ian suspects Peri may have chosen to vanish, his curiosity leads him to take on the search. Soon he finds himself drawing not only from the mysteries that have preoccupied his adulthood, but from the fables and folklore that pervaded his youth. What follows is a journey that takes Ian and those who care for Peri into the Highlands of Scotland, as the unknowns of the past and present merge in the case—and in their lives.