In Tibet, a gravely wounded John Sunlight is found by the Lama Dorjieff and his huge Thulian partner Xauz who, after nursing him back to health, realize his value to their sinister cause…. In New York, a zeppelin manned by the Silver Shirts, American Bundists led by one Bill Smith, is about to drop a bomb on the heavily Jewish Garment District. Doc Savage attempts to board the airship by means of a rocket pack but the device fails him and he narrowly avoids plummeting to his death. He makes his way onto the airship and defeats the Silver Shirts. Back at his headquarters, Doc stuns his aides by announcing that he is tired of the “Savage Curse,” the constant danger and violence his mission entails, and that he needs a long vacation to feel human again; his intended destination: the Valley of the Vanished in Hidalgo. Meanwhile, John Sunlight, having seized power by killing Dorjieff, reports to Ganth, his Nazi backer, on the progress of Project Neu Menschlich, and casually admits that he betrayed Smith and the Silver Shirts to Doc Savage. Having gotten the support he needed, Sunlight orders Xauz to kill Ganth, so he can set himself to his heart’s desire: revenge against Doc Savage. Elsewhere, gangster Breeze Castigleone is questioning one of the Silver Shirts about their weapons depot, and learns only Bill Smith knows the location. Doc’s men meet him at the Hidalgo Trading Company for a friendly sendoff, assuring him that they will continue the investigation into the Silver Shirts. When Doc arrives in the hidden Valley, he is greeted by gunfire…from warriors led by Princess Monja who tells Doc he will answer for his many crimes against her people.