"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?