Martial Matthieu, the alleged collaborator to the script, does not exist. This name is an alias for Claude Chabrol himself.
A few scenes were filmed in the country house of André Ciganer, the father of French ex-first lady, Cécilia Sarkozy. The latter, aged 4, appears uncredited as the little girl in white.
A major box-office failure, this proved a serious setback in the directing career of Claude Chabrol. However, it is generally regarded as one of his finest films.
French visa # 25363 delivered on 2-5-1962.