Nigel and Derek, two cousins who didn't like each other since childhood, went on a boat trip... from which only one of them returned - Nigel. The police do not believe his confused story about Derek's mysterious disappearance and believe that the young man is a murderer, bunglingly trying to hide his crime. But Miles Breedon and his wife Angela are not at all inclined to unconditionally recognize Nigel as a criminal. What if he's not lying and Derek, who disappeared, is still alive? And if he is dead, then why must his cousin be blamed for his death?..