Une part d'ombre

David, professor and father of two children, is suspected of murder for a crime that happened when he was on holiday with some friends in the mountains. Quickly, the investigation shows that David, under his irreproachable exterior, is in fact hiding a double life. This news upsets David's friends and family who start to doubt his innocence. While David can count on the help of his best friend who supports him unconditionally, he sees other loved ones turn away from him. David claims that another man who looks like him was on the scene the night of the murder, but some of his friends doubt this alibi.