After his family moves to Florida, Nicholas Vargas finds an ally in his new stepsister when a little nixie with a huge problem comes to him for help, giants start to destroy their neighborhood, and a hydra threatens the entire state.
After returning home from their latest adventure, Mallory, Jared, and Simon find Mulgarath, an ogre and leader the goblins, has taken their mother captive along with Uncle Arthur's field guide.
Chronicles the adventures of the Grace children after they go to stay at their Great-Aunt Lucinda's worn Victorian house and discover a field guide to fairies and other magical creatures.
Thimbletack, resident caretaker of the Spiderwick mansion, introduces readers to the faerie world and the many artifacts he has collected from the estate's former occupants.