This docuseries sheds light on the killing of a German teenager in '78 through the accounts of his sister and the royal family involved in the case.This docuseries sheds light on the killing of a German teenager in '78 through the accounts of his sister and the royal family involved in the case.This docuseries sheds light on the killing of a German teenager in '78 through the accounts of his sister and the royal family involved in the case.