Just finished reading this and it’s a piece of pure escapism. One part a Grimm’s Fairy Tale the other a Guillermo Del Toro labyrinth. But definitely suitable for both children and adults.  Here’s the blurb:

In the garden behind the cottage grows an ancient oak that hides a secret. The young boy who lives in the cottage couldn’t care less about the tree and certainly doesn’t know it is enchanted. But the faeries soon change this . . . They cast a spell that causes the ancient oak to swallow the boy whole. As the seasons pass, the boy trapped inside begins to experience the world as a tree and regret his cruelty toward nature. But the oak does not let him go. Then a new family with a young girl moves into the cottage. The girl senses magic behind the mystery of the boy who disappeared there many years ago. Will she discover the faeries and what they’ve done? And, more importantly, will she be able to break the spell?