Bing Howard a former stockbroker, is called the "Night Wind" because he is a fugitive from justice, persistently being trailed by Clifford Rushton, a private detective who has framed Howard on a bond robbery. Rushton's failure to catch Howard forces the chief to turn the case over to Detective Katherine Maxwell, alias "Lady Kate," whose brother was sent to prison for bond robbery on the same evidence Rushton has brought against Howard. Lady Kate provides a temporary hideout for Howard, then proves that Rushton is guilty of both crimes.