Ecoando meu comentário anterior, poderia ser " A Árvore Mágica Distante " de Enid Blyton.
Os personagens principais são um conjunto de irmãos masculinos e femininos. Eles descobrem uma árvore em uma floresta mágica. A árvore tem uma série de portas em diferentes alturas:
[once they're further up the faraway tree] At this moment the yellow door opened and a small fairy looked out. Her hair was fluffed out around her shoulders, drying, and she was rubbing it with a towel. She stared at the peeping children.
'Did you ring my bell,' she asked, 'What do you want?' 'We just wanted to see who lived in the funny little tree-house,' said Joe, peering in at the dark room inside the tree. The fairy smiled. She had a very sweet face.
'Come in for a moment,' she said, 'My name is Silky, because of my silky hair. Where are you off to?' 'We are climbing the Faraway Tree to see what is at the top,' said Joe.