The Three Wise Men – Balthazar, Melchior and Gaspard – are on their way to Bethlehem to pay homage to the infant Jesus when they are suddenly, an inexplicably, transported two thousand years into the future. They find themselves walking the streets of Paris, where they encounter a young woman called Macha who, they are convinced, will lead them to the newborn Messiah.

An attorney defends a young man on trial for killing his aunt — a psychiatrist who took him in to study possible homicidal tendencies.