L'Amnesia dell'Erede, la Vendetta d'Acciaio

To inherit the billions, Derek conspired with Iris and murdered Nancy. But right before the succession ceremony, "Nancy" suddenly came back with no memory. She was Daisy, Nancy's twin sister. Pretending to be Nancy, she returned, and set a trap. She exposed Derek and Iris, made them confess the murder, and finally brought them to justice.