The day after collecting donations, elderly widow Eleanor Trewynn and the vicar's wife find the dead body of a longhaired, scruffy-looking youth hidden in the stockroom of the charity shop. Then they discover that some donated jewelry thought to be fake is actually very real, very expensive, and the haul from a violent robbery in London. Making matters more complex, the corpse found in the storeroom is apparently not one of the robbers.

While out on a walk, Eleanor Trewynn, her niece Megan, and her neighbor Nick spot a young, half-drowned Indian man floating in the water. Delerious and concussed, he utters a cryptic message about his family being trapped in a cave and his mother dying. The young man, unconscious and unable to help, is whisked away to a hospital while a desperate effort is mounted find the missing family in time. The local police inspector presumes that they are refugees...