An Assassin's Story (OC)

*Cover art is not mine, I just found it at random on google*
This is a story about mind controlled assassins that I concocted in my own little brain. In this dystopian future, a mysterious organization takes whole classes of middle school to high school age kids and mind controls them to be killers. No one knows where these kids go because every one who enters one of their facilities comes out controlled. That is, unless you are immune...