Why I recommend this — 7 years ago
It gives you more insight into troll lore.
I completely underestimated them and I read this book with even more joy than “The Fifth Elephant”, which concentrates on dwarf culture. And some light (or darkness) gets shed on the mystery of the Koom Valley Battle (who ambushed who?).
Loved it. But then, I am a Pratchett fan through and through.