On their way to Monte Carlo, Monaco, Marilyn and her husband, Neil, meet several other married couples, including Julian and Phoebe, who are traveling with a lost dog they plan to return to its wealthy owner for a large reward. But, when the dog's mistress is murdered, the travelers become the prime suspects, and Inspector Bonnard is determined to track them all down.

John Candyas Augie Morosco
Jim Belushias Neil Schwary
Cybill Shepherdas Marilyn Schwary
Sean Youngas Phoebe
Richard Lewisas Julian Peters
Ornella Mutias Elena Morosco
Giancarlo Gianninias Inspector Bonnard
George Hamiltonas Alfonso de la Pena
Roberto Sbarattoas Detective Toussaint
Joss Acklandas Hercules Popodopoulos
Giuseppe Rotunno