Having read the Kindle edition, I now wish I had bought it in paper. The front of the book contains a very extensive glossary of military and intel terms and slang that you will want to know as you read, and on Kindle it is hard to go back and forth.
Mike4 is about an Army Warrant Officer, a woman functioning in a man's world, earning her stripes in recon and ending up recruited to a more pure intel role after CIA training. It is complicated by her three generation background in intelligence and a quasi-governmental Russian gangster intent on revenge for something her grandfather did. Who tries to kill off her family one by one, starting with her father.
This is volume 1 of a series, and I can't wait to read Book 2.