Fablehaven Book 1 by Brandon Mull

Trespassers will be turned to stoneFor centuries, mystical creatures of all description were gathered to a hidden refuge called Fablehaven to prevent their extinction. The sanctuary is one of the last strongholds of true magic. Enchanting? Absolutely. Exciting? You bet. Safe? Well, actually, quite the opposite . . .Kendra and her brother, Seth, have no idea their grandfather is the current caretaker of Fablehaven. Inside the gated woods, ancient laws keep order among greedy trolls, mischievous satyrs, plotting witches, spiteful imps, and jealous fairies. However, when the rules get broken, powerful forces of evil are unleashed, forcing Kendra and Seth to face the greatest challenge of their lives, to save their family, Fablehaven, and perhaps even the world.