I’ve seen Mannequin in Red described as Swedish Giallo and there are scenes which are reminiscent of the later Mario Bava film Blood and Black Lace especially with it’s fashion house setting, but it reminded me more of the few German Krimi films I’ve seen albiet with a bit more focus on style.
The plot revolves around the investigation by husband and wife private detective team the Hillmans (Karl-Arne Holmsten and Annalisa Ericson) into the murder of model turned blackmailer…