The Desperate Dwarf by Ian Irvine

It's not easy to be a hero when your bum is the size of an airship and you're bobbing around the ceiling, mocked by a host of angry dwarves. Mellie has stolen the unluckiest charm in Wychwold and can't get rid of it. Pook, who has an insane plan to rescue the Collected children, is demanding Ike's help. The demons Nuckl, Spleen and Tonsil are after Ike's innards. And the Fey Queen, Emajicka, is coming to tear his worst nightmare out of him. Only Ike can save Grimmery now. But first he has to win a contest with a lying, cheating scoundrel-the desperate dwarf, Con Glomryt.

ISBN: 9781862918603