Nicholas celebrates his 40th birthday in his country house, with some friends. He has everything he ever wished for, but, on that night, he will end up dead, on his swimming pool. From that moment on, a dead Nicholas wonders how his life would be if he had made a different choice, ten years ago. We then follow two stories: on one hand the police, trying to solve the mystery of Nicholas' death and on the other, Nicholas himself, living a different life. A second life.