Dan and the Goblin King, by Carole Thewsey

Dan never means to get into trouble… it just seems to find him. One trip into a rabbit hole leaves his uniform grass-stained and his imagination soaring. To avoid Mum’s scolding, he spins a wild tale of goblins, trolls, and a daring escape from a grumpy goblin king. But when his story earns him nothing but an early bedtime, Dan discovers that punishment can’t cage a mind like his. Alone in his room, he launches into new adventures of his own making — proving that for a boy with a boundless imagination, every mishap is just the beginning of another world waiting to be explored.