I hope you don't mind starting this thread on your behalf, Aristo but I thought I would write whilst it was fresh in my mind.
I really enjoyed the book. I wasn't sure at the start and it took a little bit of getting into but then really got going. I found the whole twin thing fascinating (reminded me a bit of Her Fearful Symmetry although a completely different type of story) especially as I have twin neices so it made me think of them a little bit.
Loved the twist at the end and glad things were looking up for main character - I am a sucker for a happy ending
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As an aside, I was kind of intrigued as to when story was set. It was obviously a good while ago (no PC's, mobile phones etc). Looked for a publishers date in the book but couldn't find one, must go and google it ....