A movie serial in 12 Chapters: US naval officer Don Winslow is given command of Tangita Island, near Pearl Harbor, where a ring of saboteurs is trying to destroy ships carrying supplies to the troops stationed in the islands and sabotage the war effort under orders from an unknown leader.

A notorious outlaw is recruited by a cattle buyer, secret boss of a gang of cattle rustlers, to impersonate the town sheriff, who is the outlaw's twin brother; and complications ensue, as the sheriff, now a hostage, is on the eve of his marriage while the outlaw's cantina-dancer girlfriend has followed him to town and is at risk of exposing him.

The Range Busters head for Pinto Basin where a series of stage robberies have occurred. To try and find the gang's boss, Crash sends out a empty money box. The plan backfires when the boss has the Range Busters identified as the robbers. Thinking it is now safe, the bank sends out a big money shipment. Needing to rob the stage, the boss gets the boys out of jail so they can be blamed. But this is just the chance they need to catch the robbers.

Marshal Tim Donovan has been sent to investigate a series of holdups. Posing as a card sharp he soon believes he knows who is tipping off the outlaws. So he sets up a fake shipment knowing that if the stage is robbed the contact person will be identiifed. But the day the stage is due the Sheriff arrests the gang Tim was expecting to do the robbery.

A Russian prince disguised as a worker and a cafe singer secretly involved in revolutionary activities fall in love.

A detective matches wits with the female leader of a crime ring.

Nancy Evans, lovely circus owner, has a ranch that she's never visited, but for sentimental reasons won't sell to Mike Abbott. Her partners, secretly in league with Abbott, sabotage the circus to force Nancy to sell the ranch; instead, she goes there to live. Will her neighbors, the Three Mesquiteers, be a match for the secret swindlers? And what's so valuable about that run-down ranch anyway?

Mystery and adventure, surrounding a stolen rubber harvest.

A small railroad is being squeezed out of business by the tactics of a trucking company owned by gangsters.

A young socialite, marooned on a desert island after her passenger ship sinks, is rescued by a sailing vessel looking for salvage and finds herself dealing with a mutinous crew and a semi-insane captain.