I've read every one of John Locke's fictional books for Kindle, and each one cost £0.77.
This is ridiculously cheap for some of the most innovative and exciting writing available today so I really don't begrudge paying an extra £1.20 for "Box", which is right up there with his best.
So, you are probably wondering why only three stars.
It's because it's a horrible let-down to find that when you think you are only 80% through the story, you turn the page and find that that's it. End of.
What follows is the opening to another story. That wouldn't be so bad if it was a new story, but it's not. It's the previous book (Bad Doctor) in the series. I think it's a fair bet that most people finishing Box will have already read Bad Doctor.