Once Upon a Crime

While journeying to Monte Carlo, Monaco, Marilyn and her spouse, Neil, encounter a number of other married pairs, among them Julian and Phoebe. This couple is accompanied by a stray dog they intend to return to its affluent owner in exchange for a substantial reward. However, when the dog’s owner is found murdered, the travelers find themselves as the main suspects, prompting Inspector Bonnard to pursue them relentlessly.