Diane Di Biaggio, brilliant head of a wedding planning agency and engaged to Alban, finds her past brought back to life when Kevin, a former lover, threatens to reveal an inconvenient truth. Ready to do anything to protect her reputation, she discreetly plans his death, which turns into a road accident.

Tristan, a violinist in a symphony orchestra, loves Lise, who is pregnant with his child, but is trapped by his wife, Solène. When Lise decides to leave him and have an abortion, Tristan sinks. Inspired by a recent burglary, he decides to kill Solène and disguise his act accordingly...

Jean-Pierre, founder of a historical reconstruction association, is about to break ground on his 17th-century ecomuseum. But André, the treasurer, discovers that he has embezzled money to achieve his goals. Jean-Pierre devises a way of eliminating him during a show rehearsal...