Langrish, Katherine. Troll Fell

Langrish, Katherine. Troll Fell. HarperCollins, 2004 [0-06-058304-5]
After his father suddenly dies, Peer is taken by his evil twin uncles to live at their mill. They live near a place where the Trolls live. There is a mythical creature that lives in the mill pond and other troll-like characters in the book. Peer figures out that his evil Uncles who terrorize the neighborhood, have a plan to sell a pair of children to the Trolls for a great deal of money. Can he warn the kids' family? Can he stop the sale? Will he get in trouble with the trolls? Will his Uncles kill his dog? Langrish has created a mythical world in this 264 page book with a great amount of excitement in the last third.