Aiden Pierce is a contract killer. He has neither morals nor feelings, thanks to a trauma. He is a really good killer and never gets catches. He is highly regarded on the darknet and other criminal cooperatives. She is one of the most known and respected mafia bosses in the world. As a drug dealer, no one questions her. She is cold, ignorant and a bit arrogant.

Late one evening in the middle of May, Aiden gets an assignment. He is supposed to kill her, the most respected and famous mafia boss. He doesn't know who the call came from and why he should kill her, but he doesn't ask any questions. The pay is good and that's all he needs to know. Now his goal is to kill her. That's where the masked ball comes in handy. This one is once a year and that is one of the few rides where all the criminal communities come together. So also she and some of her mafia employees.

Now it's 7 p.m. and everyone is there. So the ball can begins.