When Fiona Thorn, an ornery orphan with an expertise in explosives, sets out to rescue her imprisoned friend, Jaydin Rowan, she wants nothing more than a few sleeping guards and a satchel full of Blast. What she gets is a run-in with three bickering princesses that puts all four girls on the wrong side of a locked dungeon door. Now, accidentally involved in a plot to assassinate the King and accused of kidnapping the princesses, Fiona must find a way to free them all, save the King, and rescue Jaydin, all while struggling to pay the magical debt that's slowly killing her. Unless, of course, the princesses' annoying sibling rivalry kills her first. Packed with powerful magic, fun-loving fairies and a vicious ogre turned pet, Fiona Thorn and the Carapacem Spell is a fantasy kids' book sure to become a top ten favorite in middle grade fiction.