Zoe is staying with her Great Aunt May for summer vacation when she discovers a secret world, hidden inside the oak tree at the bottom of the garden - a land full of Fairy Unicorns! But Zoe soon finds out that Unicorn Island is in terrible danger. The trees are dying! Zoe and her new friend, Astra, a beautiful unicorn with silver stars on her coat, must find a way to save the trees, before it's too late… This new series is a stand-alone, but it also follows on from Fairy Ponies. Ages 7+