Fifty Fifty (or 50-50 ) tells the story of the lives of three couples: Nikiforos and Elisabeth, Mimis and Xanthippi, Pavlos and Irini. The seemingly peaceful life of the group is gradually disturbed by Pavlos' extramarital affair with the young gymnast, Maria, the relationship of Natalia (daughter of Nikiforos and Elisabeth) with Achilles, and the relationship of Kimon (son of Mimis) with the cynical Vivian, who makes him her subordinate to inherit her father-in-law's fortune.