Eleven year old Rosie lives with her family and pet dog Toby along Brambles Lane, in the village of Woodbury. She forms a friendship with a tree fairy, who has lost her way. Lily first appears to Rosie as a sparkling light, who is able to communicate with her. Lily comes in contact with a community of Tree Fairies, living in a village at the top of an Ancient Oak Tree outside Rosie's home. But the fairies lives are threatened, when the tree is infected with a disease. Rosie and Lily try to save the fairies , by making a model village in Rosie's bedroom as temporary accommodation . In doing so they encounter Wanda, a wicked witch, intent on taking over the fairy village. In assisting the fairies, Rosie is given powers enabling her to reduce in size and become invisible to humans. When Lily is captured by the witch, Rosie comes to the rescue with the help of Sneaky the spider. In order to regain the fairy village, Rosie and Lily fly off in a chariot pulled by a dragonfly to the land of the Thistle, to seek the help of the magical horses and Silvous the unicorn. During their quest they rescue Jamie Mc Donald, a little fawn, who guides them through a forest of swarming bees, to the enchanted waterfall. Ending in a battle between witches and fairies, with the help of animal friends. The story contains enchantment , intrigue, and is full of humour.