Initially the low stakes, slow paced ambience of this book was a shock in comparison to contemporary world-saving, thrill-ride, kids' books but having accepted it for what it is, I found this book to be charming and by the end, delightful. It's heavily episodic, with no discernable through-plot, but Barney and Lou's adventures with Stig when they visit their grandmother are successively more extravagant and the last two chapters are particularly surprising and fun.