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The Catholic Jean-Louis runs into an old friend, the Marxist Vidal, in Clermont-Ferrand around Christmas. Vidal introduces Jean-Louis to the modestly libertine, recently divorced Maud and the three engage in conversation on religion, atheism, love, morality and Blaise Pascal's life and writings on philosophy, faith and mathematics. Jean-Louis ends up spending a night at Maud's. Jean-Louis' Catholic views on marriage, fidelity and obligation make his situation a dilemma, as he has already, at the very beginning of the film, proclaimed his love for a young woman whom, however, he has never yet spoken to.
On the eve of his wedding, on holiday on the Lake Annecy shore, a career diplomat visits an old acquaintance, perhaps a former girlfriend. Through her he meets an intense teenager, Laura, and then lusts after her sister, Claire. Whilst Laura attempts to flirt with him, his fantasy becomes focused on wanting to caress Claire's knee.
A lonely Parisian woman comes to terms with her isolation and anxieties during a long summer vacation.
Someone wanders through a house while fleeing from a mysterious presence. Their body dissolves on-screen, and their mind is invaded by a strident gray noise.
