Forest of Secrets: Grim Hill, Book Five
When Cat and her friends are taken hostage and find themselves stranded in Headless Valley, it's clear they will need a miracle to get back home. Although they find an abandoned cabin for shelter, their supply of food and water is running out fast, their kidnappers are not on their heels, and a sinister threat lurks in the loft of the cabin. Cat has to make an impossible choice: risk the group's chance of survival, or risk her sister, who may be able to summon help using her magical skills. But if Sookie opens the door to Fairy, what will be the cost?