Brochart believes Christine has gone to Pascal Meneaux, a notorious philanderer, Pignon tries to help by bringing in a friend, Lucien Cheval, a civil servant who has Menaux's details "on his files".
Brochart believes Christine has gone to Pascal Meneaux, Pignon tries to help by bringing in a friend. Lucien Cheval "on his files" are a friend. A friend is a civil servant. This civil servant has Menaux's details. Lucien Cheval is a friend. Pascal Meneaux is a notorious philanderer.