In this spoof of McCarthy-era paranoia and 1950s wholesomeness, the characters and plot are drawn from the popular Parker Brothers board game of the same name.
On a dark and stormy night in 1954, six individuals with ties to Washington are assembled for a dinner party at the swanky mansion of one Mr. Boddy. Boddy's butler, Wadsworth, assigns each guest a colourful name: Mr. Green, Col. Mustard, Mrs. Peacock, Professor Plum, Miss Scarlet, and Mrs. White. Two additional servants, the Cook and Yvette, the maid, assist Wadsworth as he informs the guests that they have been gathered to meet the man who has been blackmailing them: Mr. Boddy. When Boddy turns up dead, however, the guests must try to figure out who killed him so they can protect their own reputations and keep the body count from growing.