Beast Quest: Rashouk the Cave Troll: Series 4 Book 3 by Adam Blade
Lurking in the Dead Peaks is Rashouk the Cave Troll. The Ghost Beast smells out his victims' fear - and turns them to stone. It will take all of Tom's courage to capture Rashouk's piece of the Amulet of Avantia, but failure means never seeing his father again...