Adaptation of Agatha Christie's 1939 mystery novel. Ten people, each with something to hide and something to fear, are invited to an isolated mansion on a small Island off the coast of Devon by a host who, mysteriously, fails to appear. Once there, they are cut off from everything but each other and the inescapable shadows of their own past lives. One by one, the guests share the darkest secrets of their pasts. And one by one, they die. Which among them is the killer, and will any of them survive?