Ten strangers are lured to an isolated island mansion off the Devon coast by a mysterious U. N. Owen. Nine… At dinner a recorded message accuses each of them in turn of having a guilty secret, and by the end of the night one of the guests is dead. Eight… Stranded by a violent storm, and haunted by a nursery rhyme counting down one by one… as one by one… they begin to die. Seven… Which among them is the killer and will any of them survive?