The Shadow Within (1970)
When a married man begins an affair with a woman from his past, he comes to suspect her young son intends to murder him.
Actors: Shima Iwashita, Gō Katō, Mayumi Ogawa, Yûsuke Takita, Kaneko Iwasaki, Shinsuke Ashida, Yoshio Inaba, Yousuke Kondou, Akiko Nomura, Atsuko Kawaguchi
Country: Japan