Having read several episodes in the adventures of three children and their friends who live in a huge tree that transports you to whichever different world is hovering above its branches each day, we return to find the tree the title 'character' – and the introduction of a fourth child. Rick (because the original name, Dick, would be too much – go figure) is a simple reintroduction to the goings-on of the world, and we're soon with all four as they find new worlds – a dreamscape world, one where everything (and everyone) is expected to be upside down, ones with fabulous treats, and of course ones with nightmares aplenty…