This is a British cyberpunk novel, which I’m reading as this months pick for the Exeter Dystopian Novels Book Club. Structurally, the book has two narratives that end up joining together. One is the story of a character named Y, who has had her memory erased and been subjected to extensive body modifications. Not least, a third arm coming out of one of her shoulders. It turns out that she is in another dimension, one that was discovered by humanity many years ago but kept secret. This place is run by a character resembling some kind of feudel king named the Manor Lord.
The other thread is set in Manchester, and the city is poverty-stricken and nearly ruined despite the technological advances that have come about as a consequence of the dimensional portals. When two mechanics steal an expensive car it turns out that Y is in the boot. This leads to explosions, assassins, fights, and kidnappings.
The book has a huge amount of ideas, and I enjoyed it through the first third. As it went on though it started getting very action heavy, and lots of things felt very underdeveloped.