Sandra, a thirty year old writing a novel in which the characters seek love at all costs, even at the risk of getting hurt, is about to marry Marco, a very rational orthopedic doctor. When she meets his younger brother Alex, a charismatic nineteen year old, she feels attracted to him as he accompanies her home, and they get into a car accident. Alex is seriously injured which causes him to go live with his brother, and the wedding is postponed. During his convalescence, a strange triangle starts to take shape which will allow Sandra to discover her true self. Thanks to Alex, she will finish her novel and regain her own life, having lived up until then , as if she were the substitute for a little sister who had died in a car accident.