Brandon Mull

The most dangerous evil has infinite subtlety and patience. Beware: It is rising.
At the end of the school year, Kendra and her brother, Seth, find themselves racing back to Fablehaven, a refuge for mythical and magical creatures. Grandpa Sorenson, the caretaker, invites three specialists—a potion master, a magical relics collector, and a mystical creature trapper—to help protect the property from the Society of the Evening...

Hours of crisis often call for sacrifice.
After many centuries of plotting, the Sphinx—leader of the Society of the Evening Star—is after the final artifacts needed to open the great demon prison, Zzyzx. If the legendary prison is opened, a tide of evil is certain to usurp control of the world.
In an effort to intercept the final artifacts, Kendra, Seth and the Knights of the Dawn race to strange and exotic preserves...

Kendra, Seth, and the Knights of the Dawn race against time and face dangers as they try to stop the leader of the Society of the Evening Star from possessing the final artifact needed to release evil from the great demon prison.

As a dark force engulfs the land, the fate of Erdas has fallen on the shoulders of four young strangers who each have forged a rare bond with their spirit beasts -- a bond that gives great powers to all of them.

"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...