Not strictly speaking a book, nor is it Tolkien, but I don't know where else to put it and it will no doubt be of interest to some 'Downers....
I've just got a Christmas issue of Radio Times and it includes a free CD - a new dramatisation of CS Lewis's
Prince Caspian. This is part 1 and the next two issues will have the final two parts, apparently. The CD also has CD-ROM content from the Narnia film.
It's the issue with a Christmassy TARDIS on the cover (and 10 page Doctor Who 'special', something else not to be sniffed at).