"And Then There Were None" is a dramatic adaptation of the best-selling crime novel by Agatha Christie. The story follows 10 strangers who receive an unusual invitation to a solitary mansion based remotely off Britain's Devon Coast. Among the guests is an unstable doctor, an anxious businessman, an irresponsible playboy, and a governess with a secret. Cut off from the outside world, the group arrives at its destination, only to find that darkness awaits them. As people start to mysteriously die, the members of the group realize there is a killer among them.