The Radio Boys on Secret Service Duty

"The Radio Boys on Secret Service Duty" by Gerald Breckenridge is an action-packed adventure about three teenage friends named Frank, Bob, and Jack who find themselves in the middle of a dangerous international smuggling ring. Using their radio skills, they are thrust into risky situations, battling crooks and working to uncover details of a plot they overhear while on a train in California. After meeting a stranger and learning some California history, Frank overhears a conversation about smuggling Chinese workers, and the boys decide to report the crime to a Secret Service agent. Together, the boys team up and become enmeshed in a mission that places them in harm's way as they work to take down the criminal enterprise.