Young and penniless medical student Edward Eden is approached by old and wealthy Egbert Elvesham, who doesn't have an heir and is looking for someone to bequeath his fortune, provided they take his name. Elvesham tricks Eden into drinking a potion which makes them exchange their bodies during the night. While Elvesham enjoys the joys of the young body, Eden is trapped in the old body (and in the identity of its previous owner), and looks for his revenge.
