The Invisible Opponent(1982)

Original title: Der unsichtbare Gegener

When a brutally murdered man is found carrying the identification papers of a struggling artist, Detective Horst Schimanski and his partner Thanner are drawn into a mysterious case involving a bank robbery, missing money, and a web of deception. As their investigation uncovers connections between the victim and a group of criminals, the case takes a sinister turn. An unseen adversary begins targeting Schimanski and those closest to him, turning the investigation into a deadly game of cat and mouse. With the threat growing increasingly personal and the enemy always one step ahead, Schimanski must uncover the truth before he becomes the next victim.