Two couples go on vacation to the mountains of Catalonia: a prosperous family with experience and lovers who are about to announce their wedding. Five days spent in a secluded place changes everything. An exemplary wife and mother of two sons suddenly becomes infatuated with her younger sister's fiancé, but she is closely watched by her husband, who already suspects his wife of infidelity. Relations between the characters become tense, circumstances put them on the brink of life and death. The novel is based on a true story. An interview with the main character is given at the end of the book.