Ariane, in her thirties, falls madly in love with a mysterious man who, one New Year's Eve, promises her an erotic and unforgettable year over the telephone. Dependent on this strange romance - the stranger refuses to reveal himself or meet her - Ariane confides in Dolorès, with whom she works at the Love Voyages agency, which specialises in meetings between singles.
Dolorès can't resist telling their office colleagues everything, especially as they haven't heard from Ariane for several days. Through Dolorès's detailed account, they all live vicariously through Ariane's fantastical and amorous relationship, all the while worrying about her because a serial killer is rampaging through their neighbourhood...
When Ariane reappears, everyone pitches in in their own way to discover the identity of this enigmatic telephone caller. Chloé, Dolorès, Bruno, Estelle and Ariane all have their own ideas, but a surprise awaits them that will change everything...
