Youth, Case studies, Prostitution, Drug use, Heroin habit, Adolescent girls, Biographies, Toxicomanie, Prostitution enfantine, Heroin abuse, Recovering addicts, Biography, Child prostitution, Substance abuse, Germany, biography, Drug addicts, Child prostitutes, History, Social conditions, Bahnhof Zoologischer Garten (Berlin, Germany), Tossicomani, Diari e memorie, Jeunesse, Usage des drogues, Récits personnels, Drug abuse, Drama, Teenagers, Teenage prostitution, Drug traffic, Railroad stations,