No Such Thing As Dragons by Philip Reeve
This is a dragon story with a brilliant twist from multi award-winning writer, Philip Reeve. Ansel's new master slays dragons for a living. He says he's hunted the monstrous worms all over Christendom and has the scars to prove it. But is Brock just a clever trickster in shining armour? Ansel is sure there are no such things as dragons. So what is the man-eating creature that makes its lair in the crags of Dragon Mountain? Ansel and Brock must climb the ice face to discover the terrifying truth.