Apologies for the unrelated comment, but I saw one of yours from three months ago: > Is it 'Into Darkness' that has the idea of a space where you can only move

Apologies for the unrelated comment, but I saw one of yours from three months ago: > Is it 'Into Darkness' that has the idea of a space where you can only move forwards, not sideways? This sounds like that mixed with the rigorous alternative physics of the Clockwork Rocket series. ...and that sounds like my kind of book, but googling only gives Star Trek links. Can you tell me the author?