Anna Brookes - In Training (HiT #1.5 Novella) by Margaret McHeyzer
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This is a short read and I devoured every page of it!
I loved loved loved it! To say the ending didn't shock me is an understatement. 
This tells the story on how Anna became "15" the assassin.
My heart broke for Anna, at 15, she watched her father get killed... At 15, she had her first kill.... killing Damon and Nox, the two men were sent to get her and killed her father.... She lost her home.... tying to survive on her own with no destination. Then faith must have it planned for her when she met Lukas, an assassin, a man she saves but a man who ultimately goes on to save her.
If you have read Hit 149, you have to read this book too, if you haven't read Hit 149, I recommend you read both now!
It is so well written, it'll keep you on your toes from start to finish.
