It tells the story of Mayte, an engineer who returns to a small town, with only 12 inhabitants, to carry out an important project. Her visit coincides with the valley's annual event. There she reunites with Jaime, her childhood love.

During the eve of the 6th of January, a record-breaking snowstorm sweeps across Spain. In the midst of its chaos, a group of robbers seizes the opportunity to hijack an armoured van. A few meters away is Leo, a finished policeman who has nothing to lose. With the unexpected aid of a young woman, he will try to stop the band from running away with their loot.

In the mid-to-late 1970s, two young women from different social backgrounds meet inside the Patronato de Protección a la Mujer (Women’s Protection Board), a state-backed institution that confined thousands of women, many single mothers, in convents and boarding schools under the guise of moral 'reform'. Ana, a rebellious 19-year-old from Barcelona, is sent by her wealthy father to a Patronato facility overseen by the merciless Sister Socorro. Amid the harsh conditions, Ana forms a deep bond with Sole, a friendship tested by escape attempts, reprisals, and an ultimate sacrifice.