The school year ends, but the real test begins as Kendra and Seth race back to Fablehaven. After discovering their grandparents run a secret refuge for mythical and magical creatures, the siblings are ready for a quiet summer. Instead, they find the preserve under serious threat from the Society of the Evening Star. This ancient and dangerous organization is determined to infiltrate the sanctuary and steal an artifact of immense power. To protect the property, Grandpa Sorenson brings in a potion master, a magical relics collector, and a mystical creature trapper. But the enemy operates with infinite patience and cunning, and time is quickly running out. Kendra must learn to control her newly discovered fairy abilities, while Seth has to find a way to stay out of trouble long enough to actually help. If the Society breaches the gates, it could mean the end of Fablehaven and every other hidden preserve in the world. You will experience a thrilling race against the clock where facing your deepest fears is the only way to survive.