Cosmo Jones Crime Smasher (1943)

Cosmo Jones a correspondenceschool detective from a small town comes to the big city to offer his services to the police He happens by where a gangster is killed by an opposing gang Socialite Phyllis Blake is running around with gang member Tom and the opposing gang plan on kidnapping her Cosmo is with Sergeant Flanagan when the attempt is made in front of a night club where a bystander is seriously wounded in the gunbattle Police Chief Murphy blames Flanagan for the shooting and demotes him Cosmo with the aid of a porter Eustace and Flanagans fiancée Susan tries to find the killer Phyllis is finally kidnapped and Cosmo decides the act was committed by one of the two gangs He has her father place an ad in the newspaper that contact has been made with the kidnappers Each gang thinks the other is pulling a double cross and one gang wipes out the other