Matrimony is a drama about the complexity of relationships. On Christmas Eve, perfect housewife Giulia Francesca Neri is worried about a family heirloom which has cracked and rushes to the junk shop to get it repaired -- little anticipating her perfect marriage is about to fall to pieces as well. While everyone in Bologna is making last minute preparations, Giulia runs into her childhood sweetheart, Fausto Paolo Sassanelli. The meeting rekindles old feelings and Giulia realizes that to create the perfect marriage which everyone adores, she has sacrificed her own personality. While waiting to meet her parents at the station, she climbs into a departing train and disappears. The family slowly disintegrates, as if she were the binding element.

La veille de Noël, Julia rencontre par hasard Fabio, l'amour de sa jeunesse avec lequel elle a rompu pour épouser Paolo.

Alla vigilia di Natale, Giulia sta preparando, come è sua consuetudine, la cena per tutta la famiglia, ma uscendo per gli ultimi acquisti incontra per caso Fausto, suo vecchio amore che scombussola improvvisamente i suoi sentimenti.

Bolonia, 1997. Giulia es una esposa y madre modelo que roza la perfección. Sin embargo, inesperadamente, en medio de los preparativos de la tradicional comida familiar de Navidad pierde los nervios y se escapa de casa.