The book "Lily and the Magical Tree" is a story about a little girl named Lily who discovers a magical tree while exploring the forest near her home. She climbs to the top of the tree and finds a hidden world filled with talking animals, fairies, and friendly trolls. Lily spends the day exploring and playing with her new friends, learning about the plants and animals in the forest, and helping the fairies sprinkle magic dust to make the flowers grow. As the sun sets, Lily says goodbye to her new friends and goes home, but she continues to visit the magical tree and have new adventures.