Gier(2009)

A down-and-out man seeks help from a psychologist. He tells her his unbelievable story. He tells her that he kills people. That he drinks their blood. He tells her that he is a vampire! Is this man a crazy maniac? A psychopathic murderer? Or is he telling the truth? The psychologist must now answer this difficult question. But can she keep her eyes on reality? Or has she long since been infected by this man's madness? Because the more he tells, the clearer it becomes that the answer is more terrible than she would ever have thought possible...