Klingenberg (2011)

Former police inspector Wolfgang Klingenberg is brought into a retirement home against his will. Rather than integrate, Wolfgang starts to rebel against the home's rules. His gut feeling tells him that something is wrong. When a resident disappears without a trace and is declared dead, he becomes suspicious and sets out to find him. He comes up against the home director and the nurses, but he is convinced that he is about to uncover a conspiracy. Before he realizes it he has been drugged. But he manages to gather his strength one last time to finally bring the truth to light.