Frank and Joe Hardy become involved in a case affecting national security when Joe dials a wrong telephone number and gets the Pentagon. Two words-- "Bombay Boomerang"-- that the boys hear before the line goes dead plunge them into a whirlpool of danger and intrigue. At the same time, Frank and Joe must save their father from a murderous gang stealing mercury shipments in the Baltimore harbor. With clues linking the mercury thefts to the top secret Super S missile mysteriously stolen from a government arsenal. In a race against time, the three Hardys foil a diabolical scheme to create widespread havoc in the United States.
Age - 8+
Author - Franklin W. Dixon
Publisher - Grosset & Dunlap
Format - Hardback
Pages - 192
Dimensions - 12.7 x 1.8 x 19.25 cm
