Walter and Automan go undercover as a couple of big time underworld operators to capture a powerful syndicate counterfeiter named Rudolph Brock who is behind the hijacking of a government truck carrying a load of paper used to print U.S. currency, and, the killing of its driver.
After realizing that Brock is behind the hijacking, Jack, Walter and Automan move to stop Brock's sale of millions of dollars in counterfeit money. As Jack pursues his methods to try and get to Brock, Walter and Automan go about their own.
Getting the idea to go undercover from gangster movies he's watched, he assumes the nom de plume, Mr. Otto. Walter and Automan immediately penetrate Brock's criminal territory in an attempt to let Brock know that Mr. Otto is there to take over. From Brock's car stealing operation, gambling casino, even his street operatives, Mr. Otto is able to lure Brock's men away from him, leaving Brock furious. Even Brock's ace in the hole, Gritch, the ultimate "heavy," joins Walter and Mr. Otto after Brock's man, Mayhew, sends Gritch to stop them.
Using Gritch to take them to Brock, Walter and Automan force Brock into a deal to sell them the counterfeit money. While with Brock, Walter and Automan learn that Brock's men nave captured Jack, who had been snooping around at the warehouse where the phony money had been printed on a top from Walter. The following day, during the money buy, Walter and Automan disrupt the transaction in an attempt to save Jack. Jack saved, Brock's man, Mayhew, runs with the money, leading our heroes to Brock who is in the midst of his wedding. Seeing the jig is up, Brock makes a break for it with the money, but Automan stops him, allowing Walter to capture Brock. With some assistance from Brock's boss who wants Brock out of the way, the authorities are able to put Brock away for a long time.
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