Nate Overbay, a former soldier suffering from PTSD and ALS, goes to an eleventh-floor bank and climbs out a window, ready to end it all. But as he’s steeling himself to jump, he witnesses a robbery. With nothing to lose, Nate confronts the robbers, and with his military training, starts taking them out, one by one. The last man standing leaves Nate with a cryptic warning: “He will make you pay in ways you can’t imagine.” Soon enough, Nate learns what this means.