At the end of their lives, Hermann and his wife Anna are pursuing the old dream of starting all over. In a sanatorium, German scientists present them with the opportunity of buying the bodies of two young, healthy and beautiful Africans. To ensure their family's survival in Africa, Apolain and Sarah decide to sell their last remaining possession: their bodies, which are in perfect physical condition. Thanks to the Personality Transfer, Hermann and Anna gain control over these bodies for twenty hours a day. For only four hours at night, after Hermann and Anna have fallen asleep, Apolain and Sarah can regain control of their own bodies.