One day, on a whim, Marc decides to shave off the moustache he's worn all of his adult life. He waits patiently for his wife's reaction, but neither she nor his friends seem to notice. Stranger still, when he finally tells them, they all insist he never had a moustache. Is Marc going mad? Is he the victim of some elaborate conspiracy? Or has something in the world's order gone terribly awry?

Though the premise may be modest on the surface, Carrere uses a man and his mustache that may or may not exist as a springboard into psychological suspense and unsettling questions.

'The Moustache' delivers a mysterious psychological thriller anchored by Vincent Lindon's compelling performance and thought-provoking exploration of identity. The film's enigmatic nature divides audiences: many appreciate its intellectual ambiguity and haunting atmosphere, while others find the confusing plot frustrating. Critics cite weak writing and unclear directorial choices as significant flaws. The deliberately ambiguous ending either intrigues or disappoints, making this a polarizing experience best suited for viewers who embrace unanswered questions.