The Rocketeer: Breaks Free (The Rocketeer: Breaks Free #4)

The Rocketeer has gone to Alcatraz in search of the traitor supplying the Nazis with the intel to attack America on her own soil. When he finds that the German invaders have gotten there ahead of him and are weaponizing the prisoners to stop our hero, Alcatraz turns into a battleground as all the opposing forces converge and the fate of America hangs in the balance.