When 18 year old Cora Jackson gets accused for the murder of her friend, it all goes downhill. She gets sent to one of the world's largest and securest prison,"Insanity," where all the craziest and most dangerous criminals go. Or so everyone thought. Inside the Insanity Prison is thousands of boys and girls 19 or younger, accused for things they never did. Soon Cora learns about the 'Lunatics' , the children that go insane and begin to murder the others for fun, then there are the 'Spider Threads', who take control of the Lunatics for their own purposes. After spending months in this prison, Cora slowly begins turning into a Lunatic, killing off people one by one, hiding her identity behind a small gas mask. People began calling her the 'Hidden Assasin' after she kills the strongest man inside the prison. After, another boy enters the school, copying Cora's actions, trying to keep her from fully becoming a Lunatic. Will she fall into the endless blackness of a Lunatic or become sane, escaping Insanity?