The Criminal Who Stole a Crime(1969)

A retired police captain, Siwy, tells a reporter about his latest action, carrying on his own investigation into the mysterious death of a Ewa Salm, a.k.a. Princess. She was a witness in a case where the defendant pled guilty and was sentenced to eight years in prison. Siwy doubts the defendant's guilt and risks his life to apprehend the real killer.