By Franklin W. Dixon
Frank and Joe Hardy get involved in a case affecting nationwide protection while Joe dials a incorrect phone quantity and will get the Pentagon. phrases— “Bombay Boomerang”— that the lads listen sooner than the road is going useless plunge them right into a whirlpool of chance and intrigue. whilst, Frank and Joe needs to store their father from a murderous gang stealing mercury shipments within the Baltimore harbor. With clues linking the mercury thefts to the pinnacle mystery great S missile mysteriously stolen from a central authority arsenal. In a race opposed to time, the 3 Hardys foil a diabolical scheme to create common havoc within the usa.