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An inept Police Inspector Killian (Paul Hurst) is assigned to investigate a blackmail case in which an equally inept amateur detective, Peter Corwin (William Gargan) is also working on the case. Joan Rankin (Florence Rice) supplies the romance.

A man (Richard Arlen) wants answers when he gets out of prison after spending seven years for a murder he did not commit.

捧、璃璃刀、万能钥匙、夜行灯、软底鞋、佐罗式黑丝绸面具……这一回，福尔摩斯和华生决定做一次专业的夜行侠。 目的地很明确--一个以勒索上流社会女性为职业的超级恶棍的臜脏的住宅……