Best Investigation movies of 1970s

Actors : Jun Fubuki, Yoshio Harada, Yûdai Ishiyama, Jun Hamamura,
Directors : Kazuo Kuroki,

In a melancholic seaside town, the bodies of two lovers who committed double suicide are found on the shore. A local reporter and the dead woman's pimp begin to investigate and find out that something very suspicious is going on.

Actors : Tomoko Saitô, Toshiyuki Nishida, Haruko Wanibuchi, Isao Natsuyagi,
Directors : Kôsei Saitô,

Famous detective Kindaichi investigates a series of mysterious murders revolving around a wealthy family.

Actors : Jiufeng Shi, Xiang Yan, Min Xu, Xinghuo Zhong,
Directors : Yaoting Shen,

A murder investigation in Donghai City leads to a larger conspiracy.

Actors : Sean McCann, Frank Moore, Lawrence Benedict, Céline Lomez,
Directors : Joyce Wieland,

A young woman marries a wealthy man she isn't in love with, but finds romance instead with the couples' painter friend.

Actors : Po Wang, Sung-il Shin, Dae-kun Lee,

The famous detective called 'the Hedgehog' finds himself the reluctant pawn of a North Korean spy who is trying to gain control of the Busan smuggling operations.