As others have mentioned, this graphic novel follows a young boy's adventures with a set of inventions, and you get to choose what path he takes.
Some of the concepts presented in this book are quite interesting: entropy, causality, whether you can prevent the future from happening. I think the way the ideas are explained is clear enough for a reasonably bright 8 year old without patronising them, and will give them some food for thought.
The production is high quality, with quirky, well-drawn pictures, bright colours and sturdy glossy pages. The author has clearly taken a lot of time and care over it. It will withstand sticky hands and multiple readings. The layout, with tabs and tubes leading to different pages, is original and involving, though we found it hard to follow the paths at times- best to keep your finger running along the line.
The book is well-executed, but at the same time it's very difficult to get past the first few outcomes. Because every decision involves a new page it is difficult to retrace your steps, so if you want to try to get to some of the intriguing pages you flick past, you have to keep going back to the beginning again and again. And even then, different decisions seem to come up with the same result. It almost seems the author is having a bit of a private joke with himself, making some of the outcomes almost impossible to get to. For many children, they will get bored and frustrated before they have exhausted much more than a fraction of the story possibilities. That's a shame, because this is a really nice idea which has got a lot of potential.