Gracia San Sebastian, financial fraud investigator, becomes involved in the disappearance of Imelda, a young psychologist who is found murdered days later. Her husband, an explosives expert with the National Guard and chief suspect, asks for her help when he hears that his wife has been murdered. Together with her friend Rafa Miralles from the Oviedo Police Department, Gracia's hunt for the killer takes her to many European capitals. At the same time, her life is falling apart. She is having marital problems and her reputation has been called into question after she accuses an official with multiple sclerosis of faking his illness in order to compete in a special Ironman competition. Will she be able to get back on track?