It's hard to review this without giving any plot away. But what I will say is that it was such a good read. I wasn't sure whether Argus was or wasn't sane at points. And I certainly didn't work out the end as it's so often easy to. It was a very satisfying end. Often books just have to tie up the ends or finish on a good note / happy ending and you think "why did they bother" but I was happily reading until the very end.