The story of Austrian, Johann "Jack" Unterweger (1950-1994), who wrote a book about his criminal past while serving a life term in prison for assault. In 1974, Unterweger murdered 18-year-old German citizen Margaret Schäfer by strangling her with her own bra, and in 1976 was arrested and sentenced to life in prison. And that was only the beginning... Epsidode 1:4 of "Serial Killers".

Jack Unterweger was an Austrian serial killer who murdered several women before committing suicide in 1994. In 1976 jailed for murder but became a literary sensation while in prison. Out on parole, he killed nine prostitutes before being caught once more.