Fablehaven: Keys to the Demon Prison

I liked this book written by Brandon Mull. After many centuries of plotting, the Sphinx – the leader of the Society of the Evening Star – is after the final artifacts needed to open the great demon prison, Zzyxx. 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 across the globe. The stakes have never been higher. The risks have never been more deadly. This is the fifth and final installment in the series.