In the Fabulous Thirties, Doc Savage and his five Amazing Adventurers are sucked into the mystery of Doc's father disappearing in the wilds of South America. The maniacal Captain Seas tries to thwart them at every turn as they travel to the country of Hidalgo to investigate Doc's father's death and uncover a vast horde of Incan gold.

Fred is living in the Paris Metro system. He is blackmailing Helena, whose safe he has robbed. Fred has various 'friends' all living in this sureal setting. The Roller is a rollerskating bag snatcher and Big Bill is a 'strongman'. The blackmail and Freds relationship with Helena and her heavies make up the bulk of the plot but on the side are Freds attempts to start a band using buskers from the Metro.

The physician's death orphans his two adolescent daughters. Their older brother is able to convert some of the doctor's small estate to cash. But it is late in the day, and with the banks closed he stores the money in his father's household safe. The slatternly housekeeper, aware of the money, enlists a criminal acquaintance to crack the safe. She attempts to get into the adjacent room where the sisters tremble in fear, but finds that the door is locked. The drunken housekeeper menaces them by brandishing a gun through a hole in the wall. But the resourceful girls use the telephone to call their brother who has returned to town. He gets the message and organizes a rescue party.

Kathy, a young child, has befriended the elderly miser who lives on an upper floor of the building where she lives. Today, while playing outside, she also makes friends with Jules, a homeless petty thief. Later, when she is in the miser's apartment, two violent criminals break in. They tie a rope around Kathy and dangle her out of a window, threatening to let her fall to the ground if the miser does not give them the combination to his safe. Outside, Jules sees her in danger, but to help her he must risk dealing with the police.

Both being national security agencies, the CIA and CONTROL have a sometimes friendly, sometimes not so friendly rivalry. CONTROL may now have the upper hand in the rivalry when Bruce and Lloyd, two of their nerdish inventors working in the gadgets laboratory, are close to perfecting their optical camouflage technology (OCT), aka an invisibility cloak. This is much to the chagrin of their counterparts at the CIA, Bob and Howard. The more personal rivalry between Bruce/Lloyd and Bob/Howard is fostered by their respective bosses, who happen to be competitive twin brothers. Bruce and Lloyd may be in deep trouble when their only prototype of the OCT goes missing. They initially believe that Bob and Howard may have it or worse that it has fallen into the hands on CONTROL's arch enemy, KAOS. But they discover that it was stolen by a beautiful woman named Isabella, working for her country, Maraguay...