A happily married real estate agent has a passionate affair with his childhood love, and makes a shocking discovery that turns his entire life upside down. As a young boy, Marc was smitten with Cathy. Years later, both have gone their separate ways. Marc (Jean Dujardin) has become a successful real estate agent and devoted family man, but when Cathy (Marie-Josée Croze) comes around looking for a house, old passions are suddenly rekindled. But after an unforgettable night with Marc, Cathy vanishes as quickly as she had reappeared. Later, when Marc learns that Cathy perished years prior in a bombing, his impulsive affair takes on an air of intense mystery. ~ Jason Buchanan, Rovi