Martial,Colette 's husband ,is madly jealous.One day,he catches his wife writing a letter and he does want to know what the message contains ,to no avail.He keeps an eye on her,sees her mail her letter and tries to recover it.He bribes the mailman who promises the mysterious paper.But Martial has got to borrow money from his in-laws.After a false letter ,Martial can read the famous message and is convinced that his wife is faithful.