I found a copy of this film, released on video in 1981. The film has not been re-issued on any other format. The film should be restored, with a director commentary. The film has one of the most clever plots ever to be displayed on film. I certainly do not want to spoil the plot for any interested viewer, so I will say little in the plot. The scene where the detectives are trying to time driving from Paris to the countryside is a gem. Brialy and Aumount are at their best. This film is just as enjoyable as another Lelouch film "Robert et Robert" which is also very hard to find, but still out there. Hopefully criterion or anchor bay will restore these classics and make them available for future movie going generations.
