In a stylish yet dark post-war Paris, a brilliant but disturbed surgeon, Georges Bonnet, discovers a way to cheat death. Through unusual experiments, he has managed to prolong his life, but at a monstrous cost: he is forced to sacrifice the lives of others to maintain his own existence. Bonnet, portrayed by the charismatic Anton Diffring, navigates between charming and terrifying as he keeps his enigmatic secret.
Bonnet's life becomes even more complicated when he falls in love with the beautiful and talented artist Lisa, who becomes his muse and reason for living. However, she begins to suspect that something dark lies behind the mystery of her lover. With the pressure mounting and the weight of guilt tormenting his conscience, Bonnet faces a tough choice: continue on his selfish path to immortality or risk everything for true love.
As the plot intensifies and the need for sacrifices grows more pressing, Bonnet starts to realize that the power he has gained comes at a far greater price than he ever imagined. With an unexpected twist towards the end, the story leads us to reflect on the nature of life and death, challenging us to consider whether it's truly worth it to play with fate. The atmosphere is as heavy as the moral dilemma Bonnet faces, leaving the audience on the edge of their seats.