The Hardy Boys delve into William S. Burroughs' "cut-up" technique…the only possible explanation for this choppy, dream-logic seventh installment of the 132,283 volume series. Part spy novel, part boy adventurer yarn, and part series of wadded up scrap paper notes covered with half-baked ideas ("Boys meet crazy/ex-Royal Navy hobo?" "Joe and Frank buy aunt spinning wheel…" Wait, maybe it's "Joe and Frank buy haunt(ed) spinning wheel"?) fished out of the writer's pocket, in The Secret of the Caves, the Hardy brothers (or ARE they? SPOILER!: Yes. they are.) discover a plot by saboteurs from an unknown "unfriendly" (presumably, pinko) country that may be French, Russian, or a similar salad dressing name nation to destroy a radar station. Unlike most Hardy Boys series antagonists, the bad guys are surprisingly competent, and achieve their primary goal of knocking over the radar tower within the first few chapters, without tipping their hands as the villains by wearing black hats, mustaches, or acting "gay" (though the boys do foil a somewhat queeny college professor without addressing their own excessive neatness, fondness for sweaters, arms-length relationships with their supposed girlfriends, and ongoing obsession with stripping down with their buddies whenever they encounter a body of water). The saboteurs' triumph is ignored for the rest of the novel, with their new plans involving the creation/operation of an electronic interference doohickey to play hob with the military's radar, and the opening of an antique store/French restaurant with shoddy merchandise and a thuggish Gaul who forces the boys to buy a flimsy spinning wheel. I swear to God I am not making that part up.
Meanwhile, endomorphic pal Chet prepares for a lonely retirement by buying a metal detector, and asks the Hardys and friend Biff Loman to join him in a search for pirate doubloons, engagement rings, or whateverthehell he's looking for down at Honeycomb Caves near Rockaway Beach (the town of Bayport provides all manner of geological anomalies to climb, fall into, and almost die in). And almost die they do indeed. While we're used to Hardy Boy chapters ending on cliffhanger by now, author/pseudonym Franklin W. Dixon—who vamp-hypnotized real-life writer Leslie McFarlane into writing his books for him—seemed intent on near-killing the living crap out of Frank, Joe, Chet, Biff, Tony, and any other friends still fool enough to hang out with the two danger-magnets.
The boys even manage to involve their beards, Iola and… Flopsy? Bitzer? (I can't remember their names since they have less personality than Joe and Frank) in the investigation, telling them to seek employment as waitresses at the French restaurant/antique store...just because. It's a plan so dumbfoundingly purposeless and obvious, it not only immediately comes to naught, it allows the French commernists (already tipped off that two idiot teenage boys are investigating their criminal organization) to stick a bomb into Chet's metal detector, blowing the Hardy Boys' wheels all to hell. Joe and Frank may have a death wish, and their parents remain remarkably cool about involving them in investigations of weapons dealers, smugglers, and the Mob, but there's no need to blow hilariously chunky Chet into stringy nuggets. At least he gets some female attention from potential Girlfriend #3, because girls always make excellent nurses.
Series tropes abound: Surprisingly, the suggestion of swimming in one's skivvies is addressed but once. However, approaching, hanging out, and breaking bread with filthy/possibly criminally insane hobos/beachcombers is still encouraged. The Hardy Boys approach new levels of brain damaged behavior as they befriend the Captain, who is plainly a person to be trusted with his labyrinthine meanderings about serving in the Royal Navy and his trusty shotgun. Joe and Frank try to investigate Captain Kook's cave and rifle through his possessions not once but twice, leading to them being near-blasted to kingdom come. Likewise, loving life no more, the Hardys and their friends repeatedly enter Honeycomb Caves, despite the threat of gun play, terrorists, food-stealing tramps, and hidden holes to hell, one of which Joe falls into, concussing himself unto unconsciousness (it's all right, they find him hours later and he walks it off). Biff, their two-fisted fighting buddy also gets his ass handed to him in the parking lot, again knocked unconscious (just a tad) shortly before the previously mentioned bomb goes boom.
I'm reminded of the Far Side cartoon with the bear holding up two skulls, making them talk like puppets for the enjoyment of her cubs: "Say, Bob, think there are any bears in this cave?" "I don't know, Dave, let's take a look."
The Hardy boys are, naturally, triumphant, subverting the saboteurs through a cunning plan of running into and then out of a cave, then sealing the entrance, leaving the authorities to round them up on the other side (or possibly to cut off their air supply. Y'never know.). Oh, and they find Morton Todd, whom I forgot to mention, since he and his weepy sister are more plot devices than characters. The vile restauranteurs/antiquarians are rounded up as well, protecting Bayport once again from foreign/French/Communist/potentially pink menace. The book ends with the hysterical revelation that Aunt Gertrude—despite her frigidity, virginity, and status as the only person in the Hardy household to recognize that the brothers will probably be dead before they reach drinking age—managed to fix the spinning wheel. At this moment, Hardy dad Fenton says to his wife, "Well, Laura. Looks like its time for our William Tell act." The scene closes with the boy's mom balancing a glass on her head and Fenton taking aim with his Webley revolver as the boys ask Aunt Gertrude what's for dinner. No, not really, but it would have made just as much sense in this mess.