Set in 1939 as Europe teeters on the brink of war, the story follows ten strangers with dubious pasts who are lured to Soldier Island, an isolated rock near the Devon coast in southern England. Cut off from the mainland, with their hosts mysteriously absent, they are each accused of a terrible crime. When members of the party start to mysteriously die, the others realize they may be harboring a murderer among their number. Who will survive? And, who is the killer?