The Hall of Doors — Janice Clark

Sammy's worried. Her cat has disappeared again. No one knows where Princess Buttermilk Biscuit goes on full-moon nights. Will she come back this time? Sammy decides to solve the mystery. When Sammy follows her cat up a moonbeam to a world of mist and moonlight, she meets Selena, who lives in a beautiful fairy-tale castle. Sammy enjoys exploring the castle with her new friend, and is fascinated by the Hall of Doors with its magical portals to other worlds. But the dreamlike adventure turns into a nightmare when Sammy is faced with the hardest decision of her life. Will she have the courage to make the right choice?