DiTerlizzi, Tony. Beyond the Spiderwick chronicles #1

Eleven-year-old Nicholas Vargas only thinks his life has been turned upside down after his developer father remarries and moves his new wife and daughter into the soon-to-be completed Mangrove Hollow. But an "expedition" to a nearby lake turns up a little nixie with a giant problem--the huge, lumbering, fire-breathing variety --and it's up to Nick, his stepsister Laurie, and his big brother, Julian (plus a familiar face from the original Spiderwick Chronicles) to figure out the best way to stop a host of rampaging giants before all of Florida goes up in smoke.--From publisher's description

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