I missed the second one, which must have been the one to introduce arch-villain Ratigan. This is almost nothing like book 1. In fact, it's not even really a detective story, at least, it doesn't feel like it. It's more like a Quatermain adventure written by Michael Crichton, bopping from place to place. Sure, they are looking for something (the apparently embarrassingly- or offensively-named eponymous cats), and thus "detecting" the location, but it doesn't feel like an investigation. Basil is more of an archaeologist than a detective here, which is fine. It moves the story, thin as it is, along at a wonderfully rapid pace. Our mice buddies are thrown immediately into the adventure, they get there, then go other places, are joined by hilariously-parodied other adventurey mice (maybe "hilariously" is a smidge generous, but "smirkily" is possibly not a word - it's the good, clean fun you'd need no explanation for if you were a youth when this came out ... in other words, kids in the 21st century will wholly miss the humor of it), and, though there is ups and downs, the downs last two or three sentences at most, until our heroes are out and about and moving on to the next exciting chapterlet. It's a far less emotional story than #1, and thus is likely a much better story for the kids.