When Kendra and Seth return to Fablehaven, they discover that Grandpa Sorenson has asked three specialists to protect the property from the Society of the Evening Star, a group determined to steal an artifact of great power from the preserve.

"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 information...

"As the evil Celebrant conquers more and more dragon sanctuaries, Kendra must raise an army of friends and allies on her own to fight him because her brother Seth and Bracken are missing" --Title verso page.

"The magical world teeters on the brink of collapse. The Dragon King, Celebrant, has united the dragons into a vengeful army, and only a final artifact stands in the way of them unleashing their fury against humankind. With established allegiances shifting under the strain, Seth and Kendra find themselves in desperate need of new allies. Seth must face his most dangerous quest--the fulfillment of his pledge to the Singing Sisters. With only Calvin...