Not much to say about this one. It is, to the best of my knowledge, the only straight-up picture book Diana Wynne Jones ever wrote. That being a genre I’m almost completely ignorant of, I’m more or less completely unqualified to judge whether this one’s any good.
The story, such as it is, concerns a girl who finds a magic leaf, but nobody in her family will believe her about it. The artwork is pleasing enough. If you have a small person in your acquaintance and you want to get them started on DWJ as early as possible, you might have use for this book; otherwise, it’s far too slight to really be appreciated in the same way as her other work.