When Kendra and Seth go to stay at their grandparents' estate, they discover that it is a sanctuary for magical creatures and that a battle between good and evil is looming.

"Very strange things are afoot at Fablehaven. Someone or something has released a plague that transforms beings of light into creatures of darkness. Seth discovers the problem early, but as the infectious disease spreads, it becomes clear that the preserve cannot hold out for long. In dire need of help, the Sorensons question where to turn. The Sphinx has always given sound advice -- but is he a traitor? Inside the Quiet Box, Vanessa might have...

After defeating one enemy and unveiling a traitor, Kendra and Seth plunge into the international world of magic. As Kendra travels to another refuge to locate an artifact of incredible strength, Seth faces another attack at Fablehaven. The creatures there are turning, not falling into evil like the fairies previously but actually turning into shadow-- evolving into powerful and more threatening forms never seen before. Even those creatures known to...