Yes - The Chronicles of Amber by Roger Zelazny. To be fair, the book big enough to drop on a cat and smush it is probably the collection of all 10 books rather than one big one. Each individual book is fairly small. And, say what you like about it, but the series is full of strong, vivid characters, including a few decent female ones - a lot of the fun of gaming in the setting is interacting with them. (It's also an incredibly incestuous setting, at least in the first five books. Pretty much anyone who does anything is all part of one family, and they're all doing it to each other. Also incestuous in the sense that the crush the main character has on his sister isn't exactly that subtextual, and he *does* get it on with someone he thinks might be his niece, and one of his brothers waxes lyrical about how it's such a shame that their father forbade brother-sister marriages.)