Sgt. Rusty Curtis of the U.S. Cavalry is unhappy about the Army's plan to replace horses with tanks so, after a medical discharge, he tries to buy his old military mount Sireson. Unfortunately, the father of wealthy socialite Sally Crandall outbids him with plans to train Sireson for a steeplechase race. Sally and Rusty develop a rivalry because she has a favorite horse of her own, but when her horse is hurt she and Rusty declare a truce and begin a romantic relationship.

Gangsters plan an assassination of a rival while he rides the train carrying him to prison.

Although young and beautiful, schoolteacher Anne Gladden fears a dull future. She finally decides to take a walk on the wild side, splurging on some fashionable new clothes and setting off to find adventure. Her new confidence inspires her to flirt with complete strangers. When a gangster pays unwanted attention to her, she ditches him and flees in his car, unaware that there's a corpse in the trunk. Determined to recover his stolen vehicle and its incriminating cargo the thug begins a desperate search. The oblivious Anne, comes to the aid of a handsome young man stranded alongside the road. Romance blooms, but after the shocking discovery of a body in the trunk, the duo decide they have to return the car. The bickering lovebirds head back to the city, trailed by both the angry gangster and the cops, who suspect the young couple of murder.

A young man, Danny, decides to get a job in order to support his mother. He's hired to work in a garage, but soon finds himself being implicated in a stolen-car racket.

Boston pharmacist Tom Craig comes to Sacramento, where he runs afoul of local political boss Britt Dawson, who exacts protection payment from the citizenry. Dawson frames Craig with poisoned medicine, but Craig redeems himself during a Gold Rush epidemic.

Sam Bernard in the kitchen cooking up something for his loved one.

Dick Tracy goes up against a villain known as The Ghost, who can turn himself invisible.

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.

Rejected by the Army, Marines, and Navy for being too young, the punks help the war effort by throwing fruit at a shop they believe is owned by a Japanese American. Confronted by him wielding a short sword, the gang decides to come back at night but find him dead.

Filmed in the Sierra Nevada mountains near Sonora, California, this Universal serial is Universal's 40th sound-era serial. Eagle Scout Bruce Scott, leader of Martinsville Troop Number One, and his pack sets off in search of lost treasure and finds adventure