I picked up this book not realising that it's the third in a series. Nothing obvious to tell me that. Consequently I spent a large part of the book trying to figure out the relationships between various characters. Some valuable pieces of back history are finally given, but not until near the end. So if you are new to Alex Dryden, this is not the place to start. Start with Red to Black instead.
Anna Resnikov is an ex-KGB agent who defected several years ago when she fell in love with a Western agent (now deceased). She is one of the main characters in this book, but she's an enigmatic character who is only sketchily described. I never felt that I understood her or her motivations. She works for a US-based black ops group. They are concerned about Russia's increasing aggression towards the Ukraine, trying to engineer an excuse to invade the country. Anna is sent into the Ukraine undercover to retrieve evidence.
The "Blind Spy" of the title is a Russian agent who is also sent to the Ukraine by his country. He is blind, but he has a credibility-stretching talent for knowing things at a psychic level, to the point where he can apparently tell what colour clothing people are wearing or how many seagulls are flying past. He and Anna have a long and complicated back history.
There are a couple of stand out action sequences when Anna is in the field, but otherwise this is a tedious read with a lot of posturing in conference rooms between characters whom I felt absolutely no involvement with. Towards the end there is a big development which would probably mean significantly more to anyone who has read the previous novels in the series. Not having done that, I can't recommend it.