The Rocketeer: Breaks Free #2

Cliff's intentions were pure this time-they really were. All he wanted to do was accompany his gal, Betty, to the City by the Bay to shoot her new movie and keep himself outta trouble. Well, trouble had other ideas! The Rocketeer finds himself up against three Nazi U-Boats, which have launched acovert surprise attack on the Golden Gate Bridge. And what could they possibly want with the Rock, a.k.a. Alcatraz? And why is the Rocketeer at the very center of their plans?!