Ten . . ." 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?