Red Shirts is a parody of Star Trek. It's smart and funny and a long afternoon's read and you'll thank yourself for it. Right at the end, Scalzi takes the book's concept right up to 11, and you'll thank him for doing that for you.
Thanks Mr. Scalzi, you did me a solid there.
See? Just like that. Anyway, the book ends about 2/3 the way through the book, but the afterwards will let you down slowly.