On a weekend vacation Beth Anderson is unnerved when a stroll on the beach reveals what appears to be a skull. As a stranger approaches, Beth panics and covers the evidence. But when she later returns to the beach, the skull is gone. Determined to find solid evidence to bring to the police, Beth digs deeper into the mystery of the skull—and everywhere she goes, Keith Henson, the stranger from the beach, seems to appear. He claims to be keeping an eye on her safety, but Beth senses other motives. Then a body washes ashore, and Beth begins to think she needs more help than she bargained for. Because investigating is a dangerous game, and someone wants to stop Beth from playing.