Frotwoot's Faerie Tales (Book Three: Revenge of the Warlocks)

Frotwoot had always thought that the hardest part about bringing his girlfriend home to meet his parents would be dealing with the fact that she's a goblin. But as it TURNS OUT, it was actually getting caught up in a coup to overthrow a corrupt government of wizards and witches who'd been enslaving the people of Seelie for countless generations, and were now thinking of setting their sights of Earth. Huh. Who knew?