This Edgar Wallace thriller was written by Philip Mackie, who pursued a successful career in film and television, and starred Bernard Lee in one of hishard boiled roles. Nothing especially original here, but the plot zips by ans the ensuing is convinces, as Lee investigates the apparently motiveless demise if a Greek entrepreneur. The film also explores the relationship between inspector and his chief sergeant sidekick (David Knight), in a fashion that has now become axiomatic in television drama.