AllMovie

A detective investigating the murder of a young girl makes a startling discovery that leads him into the world of international stamp collectors in this thriller from Academy Award-winning cinematographer-turned-director Jack Cardiff. A young girl lies slain, and the only hope for revealing the culprit behind the crime lies in a veteran detective (James Booth) determined to crack the case. When the detective's investigation leads him to discover that the victim had an evil twin sister, the case takes an ominous turn into a world viewed by many as an innocuous pass time.