By chance, while pursuing this hunch, he discovers that the actress Hélène Lanson was the passenger in a car that was damaged on the day of his son's death. Adopting a pseudonym, he seduces her and discovers that the driver was her brother-in-law Paul Decourt.
By accident, while following this intuition, he uncovers that actress Hélène Lanson was a passenger in a vehicle that sustained damage on the day of his son's death. Using a false identity, he seduces her and learns that the driver was her brother-in-law Paul Decourt.