The Burning Shore
The Burning Shore was not a particularly thrilling read, but it was nice to see the Lizardmen featuring in a Warhammer book for once; even if it was only for a few chapters at the end and was written during the 5th edition of the game where they're almost a comic relief faction like the Orcs.
If you're not interested in the background for a sub-faction of a tabletop Wargame, I probably wouldn't bother.