Alone at home, a fourty-something years old spend his containment days doing sport, cultural activities and chatting on the phone with Franck, his only friend. On a morning, he finds out an old coin into his kitchen's ventilation entrance.

John Dubury, a fifty-year-old man disappointed by his life, sees his wife die from a fatal fall while they are on vacation together. And while an accident is initially thought to be the cause of death, suspicions soon turn to John... especially since a witness claims to have seen him push his wife.