A government agent and a casino owner in San Francisco join together to expose an extortion scheme cooked up by a Confederate Army officer.

Jeff's plan to find a stash of counterfeit money goes sour when the counterfeiter is killed. His solution is to enter a reluctant Cash in a high-stakes poker game.

When a pair of jade cat statues are stolen, Jeff Cable goes undercover as a mercenary reporter to recover them, and it's up to Cash Conover to see that his friend survives the experience.

When Jesse James comes out of retirement to rob a bank, Jeff Cable is determined to arrest him. He enlists Cash to help him infiltrate the James Gang, unaware that their robberies are planned by a beautiful woman.

To recover stolen money stashed in a jail cell, Jeff masquerades as a crook and has himself arrested. A jail break interrupts his search, and it's up to Cash to save his friend from a gang of outlaws before an old flame blows Jeff's cover.

When a load of rifles is hijacked, Cable has Cash put out the word that he know an interested buyer: Jeff in disguise. The plan is complicated by the arrival of a girl from both their pasts, who, with her new husband, is seeking to buy the guns herself for a proposed revolution in Tahiti.

To stop an assassination, Jeff stages an elaborate con to trick an Irish saloon-keeper into thinking he is accused of murdering his business partner.

Cable disguises as a gypsy with a gift for prophecy to goad crooked gambler Austin Benedict into a poker game with Cash, Benedict's diary wagered against the Golden Gate, winner take all.

When the plans for a submarine are stolen, Cable is sure the thief is a powerful racketeer who is trying to shut down the Golden Gate. A disguised Jeff enters the bidding for the plans while Cash tries to steal them back.

Fishermen on the Barbary Coast are paying protection money to The Shark, though no one seems to know who he is. Cable eyes a handful of suspects, arranging a boxing match to smoke out the Shark...a match that pits the champion against Cash.

While Cable has his eye on a pair of swindlers and their phony diamond mine, Cash must deal with the local protection racket. Jeff suggests combining forces, and Cash reluctantly agrees.

Cable is at first convinced he has captured John Wilkes Booth. But a series of events has him suspicious about his prisoner's true identity.

Two investigations overlap as Cash's customers are being robbed by the daughter of an old friend, while Jeff investigates a gang out to rob the vault of a local shipping company.

Jeff is on the trail of stolen gold about to be claimed by the heirs to the original thieves, each of whom has a marker that will unlock the secret location of the treasure.