Jim Phelps poses as an amnesia victim in order to retrieve a stolen isotope, one that could make nuclear weapons affordable to any country.

Anna Kerkoska plans to defect with a list of American agents given to her by her father, the late Premier. Her brother Alexi also plans to defect, but it's actually a plan to grab the list, turn it over to Police Chief Petrovitch, and sell out his sister. Jim and Dana pretend to be a publisher brother-and-sister team and Paris kidnaps Dana to fake-force Jim to kidnap Anna for the Americans. Petrovitch and Alexi let the plan go ahead, while Jim becomes romantically involved with Anna. The bad guys overhear Jim ""confess"" how he is going to smuggle Anna out of the country, unaware its a ploy to draw them away from the real means of escape via a mini-race car in the back of the hearse - Jim and Anna use it to bypass the mined security gate and exit the country.