Lonely Heart (幸福, Kōfuku) is a 1981 Japanese mystery film directed by Kon Ichikawa,[1][2] based upon the 1961 American novel Lady, Lady I Did It in Ed McBain's 87th Precinct series.

[3][4][5] The film stars Yutaka Mizutani, Toshiyuki Nagashima and Rie Nakahara in a police procedural surrounding murder at a bookstore and the private lives of the cops trying to solve the case.

The New York Times said the film is moderately successful but the characterizations lack depth and detail.

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