As a tropical storm approaches the West Indies island of Mustique, an American heiress heads out for a morning swim and doesn't return. The only local police officer, Detective Sergeant Solomon Nile contacts the island's owner, Lady Veronica Blake, who catches a plane immediately. Her beloved god-daughter, Lily, is on the island and this disappearance has alarming echoes of what happened to Lily's mother many years ago. As Nile, Veronica, and Lily try to corner a killer, the storm hits, and someone else disappears.