Book two of the original Tom Swift series (1910-1941), Tom Swift and His Motor-Boat picks up shortly after the events of Tom Swift and His Motor-Cycle. When a damaged motor-boat goes on sale at public auction, Tom wants to win it so he can refurbish the boat for his own use. His father, Barton, counsels Tom not to bid more than two hundred dollars, and Tom is relieved to win for exactly that amount, narrowly outbidding his adolescent rival Andy Foger and a suspicious-looking man. Tom dubs his fixer-upper the Arrow. All goes well until Tom catches the strange man from the auction fiddling with the Arrow; later, Andy makes a few ham-fisted attempts at revenge because he lost the auction. Tom will have to keep a sharp eye on his boat, but once he gets it fixed and can move freely on massive Lake Carlopa, all the headaches will be worth it.
Tom worries about his father after the stress of the Happy Harry gang stealing his inventions in the previous book. Barton could use a vacation, and Tom suggests the two of them and Tom's chum, Ned Newton, cruise down Lake Carlopa in the Arrow to Sandport. Tom and Ned can camp out for a few weeks while Mr. Swift stays at a nice hotel. The specter of the Happy Harry gang looms, however, when Tom again catches a stranger tinkering with the Arrow. He inspects the boat for damage but finds nothing wrong. Why are people intent on poking around in the vehicle's engine? Tom, his father, and Ned settle in at Sandport, but Tom returns home in his boat when he hears that all may not be well at the Swift house. He doubts that Happy Harry or Anson Morse would target Barton's inventions again, but Tom wants to set his father's mind at ease so he can enjoy himself.
From this point, the Swifts fall victim to a string of thefts. The Arrow is stolen, and Tom can't feasibly search every inlet of Lake Carlopa for it. The Happy Harry gang may be the guilty party, but is Andy Foger just as likely a culprit? He was outraged when Tom won the Arrow at auction, and swiping the boat would be in line with his brand of pettiness even after his father purchased him a new boat of his own. Tom has to be cautious not to jump to conclusions. When he finally returns to Sandport, the Swift family's domestic staff calls to say there's been a break-in, and several of Barton's unpatented inventions are missing. Vacation hasn't been as soothing as Tom hoped, but if he tracks down the thief, maybe he can retrieve his father's inventions and learn why someone would want the Arrow badly enough to steal it. Tom's boat may contain more value than he realizes...
Tom Swift and His Motor-Cycle was an awkward read, and Tom came off as far less intelligent than his reputation indicates. The story also relied heavily on coincidence. Tom Swift and His Motor-Boat depends on coincidence a lot as well, but the writing flows better and the action is exciting. The book improves on its predecessor in most every way, and there's even a hint of future romance as Tom becomes comfortable with Mary Nestor, the girl he's taken a shine to. Tom Swift and His Motor-Boat transitions smoothly into the next episode, Tom Swift and His Air Ship, and I look forward to more adventures as the young inventor stretches the limits of his brilliant mind. Whatever era he's in, Tom Swift is someone to be reckoned with.