The documentary solved for the first time a century-old mystery by using a family DNA test to reveal the secret identity of the man known as the Collegno Amnesic. The film tells the incredible and touching true story of the Italian man whose double life was romanticized and featured for decades in movies and theaters. It also sheds light on the controversial techniques of investigation and care used in old neuropsychiatric sanatoriums, as well as the relevance of the tests once employed to unmask liars in court.