Today is a big day for Sylvain Sabourdin: he has to meet his future father-in-law, go through a job interview and make big decisions. But while he is getting ready, a power outage prevents him from shaving completely and leaves him with a moustache: Hitler's moustache.

Maxime Depratte, a charismatic company director, invites Corentin Michelot, his meticulous and unassuming accountant, to dinner to "fix" a compromising financial statement just hours before a board meeting. Ségolène, Maxime's wife, is very upset about being an accomplice to this foolish dinner. However, through misunderstandings and plot twists, the three of them will uncover the hidden sides of t...