Okay, this book was extremely well written, Shuri can write. It gains a high score for readability. Unfortunately the characterisation and general plot in the first half of the book really let it down. I will admit that I was massively losing interest by the time Eric helps Adam escape. It reads a lot like anime fanfiction. Things happen because the author wants them to, not because she's listening to her characters.
The reason I mention anime is that the main villain is straight out of 'every' yaoi anime I have ever seen. Long black hair, slender, sensitive with a snarky sense of humour. And like most villains in animes, he is much maligned.
The world building is good, but underdeveloped. Apparently the world fell into anarchy and warfare for resources. That I can accept, but I can't accept the heavy futurism that's occurring at the same time (if there are few resources-where does the tech come from?). There is no basis for how this society is functioning if England is isolated. There's no explanation for the industry and engineering, much less how people are fed if there are only cities.
***** for writing minus ** for plot and characterisation.