Ten strangers are drawn away from their normal lives to an isolated rock off the Devon coast. But as the mismatched group waits for the arrival of the hosts, the weather sours and they find themselves cut off from civilization. Very soon, the guests, each struggling with their conscience, start to die - one by one, according to the rules of the nursery rhyme "Ten Little Soldier Boys" - a rhyme that ends with the most terrifying words of all: and then there were none.