When the Grace children go to stay at their Great Aunt Lucinda's worn Victorian house, they discover a field guide to fairies and other creatures and begin to have some unusual experiences.

Three ordinary kids, Jared, Simon, and Mallory Grace, have entered another world -- without leaving this one!

Eleven-year-old Nicholas Vargas's life is turned upside-down when his father remarries and moves him and his new family to Florida; but when an expedition to a nearby lake turns up a little nixie, Nick, his brother Julian, and step-sister Laurie have to figure out a way to stop a horde of rampaging giants.