In contemporary Paris, German filmmaker Tomas embraces his sexuality through a torrid love affair with a young woman named Agathe, an impulse that blurs the lines which define his relationship with his husband, Martin. When Martin begins an extramarital affair of his own, he successfully gains back his husband’s attention while simultaneously unearthing Tomas’ jealousy. Grappling with contradicting emotions, Tomas must either embrace the confines of his marriage or come to terms with the relationship having run its course.