Review: Fablehaven by Brandon Mull

From Goodreads:
For centuries mystical creatures of all description were gathered into a hidden refuge called Fablehaven to prevent their extinction. The sanctuary survives today as 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 that their grandfather is the current caretaker of Fablehaven. Inside the gated woods, ancient laws keep relative order among greedy trolls, misc...