At Sinclair's home, Jenny discovers that he is a Nazi secret agent and knocks him out, but is soon re-detained and forced to leave a message for Cliff to bring the rocket pack to the Griffith Observatory in exchange for her life. Just before he is arrested by the FBI and taken to Hughes and Peevy, Cliff hides the rocket pack. Hughes explains his rocket pack is a prototype, similar to one Nazi scientists have, up to now, been unsuccessful in developing; he shows them a horrifying propaganda film that reveals the scope of the Nazis' plans, depicting an army of soldiers using rocket packs to invade the United States. He also then mentions the FBI are trying to locate a Nazi spy in Hollywood, whom Cliff realizes to be Sinclair. When Hughes and the FBI demand the return of the rocket pack, Cliff explains that he needs it to rescue Jenny; he escapes (using a scale model prototype of the Spruce Goose as a glider), but inadvertently leaves behind a clue to where he is headed.