Elizabeth Moon 
Engaging The Enemy [EPUB ebook] 
Vatta’s War: Book Three

Kylara Vatta has had to leave a glowing future as a military cadet far behind, and now carves out a living in the brutal cut-throat world of interplanetary trading. Her chosen way of life is tough but rewarding and she thinks she is more than capable of holding her own. That is, until a threat emerges that nobody could have forseen . . .’Continues to get better with every volume . . . roll on the next one’ Guardian