`And Then There Were None' is a drama adaptation of the best-selling crime novel by Agatha Christie. The story follows ten strangers who receive an unusual invitation to a solitary mansion based remotely off the 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 arrive at their destination, only to find darkness awaits. One by one, the host forces the individuals to face their fears before ruthlessly murdering them.