Death in Silver
Lester Dent
 The Silver Death's-Heads, a gang of criminals who wear silver overalls and masks, have been committing seemingly random crimes for months. They become involved when they attack Paine L. Winthrop, a shipyard owner who has offices in the same building as Monk. When his office explodes, Monk and Ham investigate but are captured while reporting back to Doc Savage. With his other aides abroad, Doc Savage attempts to rescue them and solve the case alone. One of the first things he accomplishes is to deduce the nature of the explosion, which has eluded his aides and the police &mdash; it was caused by a three-inch shell. Investigating the deaths of other witnesses to the attack (a fisherman on the river and an aviator flying that day) leads Doc to Winthrop's Shipyards. The Silver Death's-Heads steal some blueprints to hide their secrets while Doc runs into Winthrop's Secretary, Lorna Zane, and efficiency expert, Harry "Rapid" Pace (who has the annoying habit of repeating almost everything twice). Doc leaves Lorna with his cousin Pat at her new beauty salon/gymnasium. Harry leads the Doc to the home of Bedford Burgess Gardner (owner of Transatlantic Lines and Winthorp's chief rival) based on a comment from the gang overheard at the shipyard. Again they run into the gang, and pick up Hugh McCoy, Gardner's Financial Relations Consultant (advising on the merger with Paine L. Winthrop's company) and Pace's rival for Lorna Zane's affections. By questioning an injured gang member, who had been poisoned by his own gang, they find that Monk and Ham are held at the "Indian's Head". Doc browses a telephone directory at an all-night drug store and picks out the "Indian Head Club". When asked he explains that its address is on the waterfront and the Silver Death's-Heads always seem to escape by the river. His deduction is correct and, through stealth and violence, he rescues his aides. They all only narrowly miss being killed when the gang demolish the club with a bomb to destroy evidence. Meanwhile, the Silver Death's-Heads kidnap Pat and Lorna from Pat's salon. Based on a map of New York Harbour found at the club before it exploded and burned down, Doc and Monk go out onto the foggy river to investigate. Diving from the boat, Doc discovers a submerged radio-buoy at a point marked on the map. Further investigation is cut short by a shell apparently fired by an unseen submarine. Ull, the leader of the Death's-Heads (but not the "big brain" behind their plans) sets a trap for Doc with Pat and Lorna as bait. A fake snitch calls Doc with some information but is cut off by a mock attack in another all-night drug store. They make sure to leave clues, especially a trail of footprints in vaseline (from a jar "accidentally" broken in the store), to lead Doc to their hideout. Doc follows the trail using ultraviolet light (because Petroleum jelly glows under ultraviolet light) but approaches the hideout itself in disguise. He is able to penetrate the hideout and successfully avoid the traps set for him but does not manage to rescue Pat or Lorna (as they are not really there). Moving back to the radio-buoys in the river, Doc and aides (along with Rapid Pace and Hugh McCoy) set out in the Helldiver (Doc's submarine). They follow a trail of hidden buoys out into the Atlantic where they are attacked by another submarine (the buoys are intended to guide the villains' submarine down the river to an abandoned sewer that connects to the Indian's Head Club). They are eventually boarded and Doc Savage is apparently killed (this is a common event in Doc Savage stories). The rest are taken in the villains' submarine to their base in an almost derelict rum row ship. Doc, hanging on to the side of the submarine, sneaks aboard the ship, rescues everyone, recovers a lot of stolen goods and escapes in a lifeboat. A fire he started as a diversion causes an explosion (speculated to be either from the fuel tanks or a stockpile of explosives) and the ship sinks as they leave. The big brain behind the plot turns out to be Hugh McCoy, who was also Bedford Burgess Gardner (by using a fake beard). Ham's research showed that "Gardner" had made over $1 Billion in the past year by using the gang to kill off opponents and rivals under cover of random crimes. He would then buy out their companies and make his money through stock manipulation. Rapid Pace, who becomes less cowardly throughout the story, ends up with Lorna Zane.