Jeremiah Valeska is completely sane, an engineer with a brilliant mind, and no one knows this better than Y/n, his best friend. Despite desperately wanting to be more than friends however, Y/n stays by his side. But in the words of a madman; "All it takes is one bad day to make a person go insane."

"You know I love you, right?" "You know you're crazy, right?" Sick, sadistic , insane. Jerome Valeska isn't new to scrutiny. However he wasn't always a monster. When Y/n Gordon, younger sister to Detective James Gordon, is dragged into his world, what will happen? Will she keep what little sanity she has, or lose her grip falling in love with a psychopath?