A small town in Spain, October 1955. Isabel, a 35-year-old dreamer who feels like a failure because she is not married yet, becomes the new target of a group of soulless pranksters.

A marriage without great financial resources and bad luck wins a little lamb in a raffle. Once they have decided to have it for dinner on Christmas Eve, the couple warn that their children have grown too fond of the animal, now christened as Bolita.