The Black Annuler (Short Story)

7 gorgeous girls. 5 dead. 1 killer.
A virtuoso killer has been set loose, and it's up to Detective Burr and his team to find him. Each girl, dressed up beautifully, is found dead with just a stab in the heart by a knife. No matter what, Burr finds himself one step behind the killer, who they've dubbed The Black Annuler. At the Institute, Burr meets Paradise, a gifted, yet deeply-troubled girl. With her help, he plays a game where there's a thin line between life and death: to kill, or to be killed.