Book 1: What We Had in the Beginning
22 parts Complete Surviving, that's all Natalia's been doing ever since she was a little girl. She's been forced to kill, punished, broken, and put back together. All to make her into the perfect assassin, a Black Widow. She wants to survive, but the only way to do that is to become what they want. However, that may be difficult when someone she thought was just a legend comes to train her and compromises everything she's been working for.
This is the first book. Book 2 is already up.