The Adventures of Mr Pink-Whistle  (English, Paperback, Blyton Enid)

Mr Pink-Whistle is half brownie, half human and he can make himself invisible. He uses this magic trick alongside his ability to communicate with animals to right all the wrong things he comes across. From converting the mean Wilfrid into a kind, caring boy, to entertaining Jackie who was too ill to go and watch the conjurer, Mr Pink-Whistle ensures that everyone is happy and that everything is fair.