Cosmo Jones, a correspondence-school 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 gun-battle. Police Chief Murphy blames Flanagan for the shooting and demotes him. Cosmo, with the aid of a porter, Eustace and Flanagan’s 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.
A cop pretends to be a crook in order to catch a gang of outlaws. The bad guys run a night club as a front. The cop’s sister helps him by singing there; otherwise, she’s busy making love to a military cadet.
Ace newsreel cameraman is working in a mythical European country when the king is assassinated. He gets his negatives out of the country and finds the young crown prince who is also in danger.
In the small town of Larrup, Arizona, Smiley, a con-artist traveling with cohorts Kingfish, Morris and Ambrose, persuades Lynn Martin, a traveling demonstrator of pancake making, to accompany him to a carnival, where Kingfish sells a large number of bottles of Bambo, an elixir…
Celebrated as supersleuth, Mr. Moto comes out fighting when a brutal boxing match turns into cold-blooded murder! Assisted by detective-in-training Lee Chan, Moto sets out to track down the killer based on a single ominous clue: a poisoned boxing glove! But when Moto’s hunch points to a corrupt gambling syndicate, he’s forced to wager his very life to unmask the culprit—or go down for the count…permanently!