You won't know I'm gone

the long version

"Going rogue in an effort to rescue her kidnapped parents has cost Reagan Hillis her automatic ticket to the Training Academy. But becoming a Black Angel is the only way Reagan will be able to exact revenge on her mother's merciless killer, Santino Torres. When Reagan is given a chance to prove that she’s worthy of training to be a Black Angel, she also gets the first chance she’s ever had to be her true self. No aliases. No disguises. But when her friend Luke joins her at the Black Angels training compound, Reagan finds herself once again torn between the person she was and the person she wants to be. Reagan has to prove that she's as good as her parents trained her to be, because she’ll never find Torres without the Black Angels’ help."--Amazon.com.