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Surviving the crash from the bridge with little more than scratches, Jack (Tom Brown), Tommy (Edgar Barrier), and Captain Wing (Keye Luke) continue their search for Blenker (David Hoffman) and his captive, Mah Ling (Cyril Delevanti). While the latter two trail Blenker's car, Jack searches the jeweler's shop where he finds documents leading to the "Lorelei IV," a supposedly derelict houseboat docked in the harbor. Meanwhile, on the "Lorelei IV" herself, Axis agent Fraulein Von Teufel (Rose Hobart) witnesses a demonstration by Schlesser (Frederick Giermann) of a phonographic device that can alter the words of any recorded voice, a powerful propaganda tool in the wrong hands. Moments later, Blenker arrives with Mah Ling, whose dismay at discovering the real identity of the Fraulein is recorded for prosperity on the device. When Jack attempts to free the elderly statesman, however, Mah Ling is shot and killed by Blenker before he can reveal the identity of the Fraulein. When Tommy, Wing, and the police finally arrive on the scene, they find an altered recording on which Mah Ling is heard accusing Jack of being Fraulein Von Teufel himself. Just as the Hawaiian police sergeant (Jack Strang) is about to arrest Jack, Wing shoots out all the lights on "The Lorelei."