In New York City, the NYPD struggles to track down a serial killer known as Sister Militia, who has been targeting mobsters and other criminals in the Big Apple. No one knows who Sister Militia really is except a few residents of a Catholic orphanage. Her name is Tista...

Tista's activities as the grim reaper of New York City have drawn the attention of the FBI. Agent Snow makes contact with Arty and begins to investigate. Meanwhile, Tista continues to bury her emotions in order to complete her deadly missions. But when the organization she serves issues a particularly cruel order, can she carry it out?