How Did You Get In? We Didn't See You Leave (1984)
Clovis Blaireau is a private detective. It is charged by Nadège de Courtaboeuf wife knew wealthy industrialist Prosper de Courtaboeuf, to obtain evidence of the infidelity of her husband. Clovis managed to penetrate the intimacy of Prosper, and became his friend. Following diverse Clovis and Prosper