Vincent meanwhile has a girlfriend, Julie, who is a bit highly strung, and one evening 'loses it' because Vincent is playing poker with some friends. The friends leave, Vincent and Julie fight, and Julie is killed as a result of a terrible accident.
Vincent, obviously fearing for his career, hatches a plot to absolve himself from blame. He drives to Muriel's, where without telling her what has happened, he asks her to drive to his sister's in Switzerland, having moved Julie's body from his car boot to hers. Muriel would do anything for Vincent, so she agrees.
As far as Vincent is concerned everything goes to plan, Muriel having confirmed as much. But things didn't go to plan, and Muriel used her initiative, resulting in Julie's body being discovered in the Dordogne.