When attractive American Jacqueline Kirby is invited to an English country
mansion for a weekend costume affair, she expects only one mystery. Since the hosts
and guests are all fanatic devotees of King Richard III, they hope to clear his name of
the 500-year-old accusation that he killed the little princes in the Tower of London.

Jacqueline is amused at the group's eccentricities until history begins to repeat itself.
A dangerous practical joker recreates famous fifteenth-century murder methods:
beheading, poisoning, smothering, and even drowning in a butt of malmsey. As the
jokes become more and more macabre, one at last proves fatal.

Jacqueline puts all her observations together for a dazzling solution that will surprise
even the most attentive listener.