In Le Crime ne Paie pas, the adaptation of The Murder on the Links, Marthe Salmont is the parallel of Mme Daubreuil. Prior to the opening of the episode, Marthe was the lover of Paul Deboise, until Paul killed Marthe's wealthy husband. Since then, Paul had disappeared until they casually met in Melvil. At that point, Marthe decided not to kill Paul but she decided to blackmail him.
Marthe is the illegitimate mother of Eloise Morel.