为了阻止邪恶的摄政王，不可能小组不得不开始“寻找”王位继承人，他们能否成功呢？

The Archbishop of Povia must designate a heir to succeed the departed king as regent, as the king left no heir. General Qaisette plans to seize the throne in a coup if he isn't named. The IMF spread rumors that Princess Celine, who disappeared as a child, is returning. Cinnamon studies Celine's life. Barney and Willey lead Qaisette to Phelps who has an elderly blind Celine/Cinnamon. Thanks to Rollin who claims to be a doctor who knows about the ""real"" Celine's crippled arm, Qaisette believes he can use the ""fake"" Celine to discredit the Archbishop. But Cinnamon manages to pass every test (with some help from Barney) and Rollin ingeniously sneaks out before Qaisette can call him as a witness. Cinnamon-as-Celine has Qaisette arrested and then abdicates the throne, disappearing once more.

L'équipe de Mission Impossible doit empêcher la nomination d'un régent dans une petite monarchie des Balkans. Jim Phelps et ses agents fondent leur plan sur une légende locale : l'héritière du trône, mystérieusement disparue alors qu'elle n'était qu'une enfant, peut réapparaître à tout moment pour sauver son pays.

Cinnamon se hace pasar por una princesa perdida, en un plan de Jim para frustrar un golpe de estado preparado por un militar.