SWAN SONG is a good choice and an enjoyable read. Don't plan on finishing it in one sitting though. Another good McCammon choice is BLUE WORLD, a compilation of short stories including the BLUE WORLD novella. Within is YELLOWJACKET SUMMER, a particularly nasty tale.

I realized after you posted that I have a copy of MOUNTAINS on my computer. Hoping to dive into that one soon. Glad you brought it up.