An ancient and long-forgotten creature is preying on vulnerable residents in Philadelphia. After a chance encounter, former Navy corpsman and Afghanistan veteran Kevin Maloney begins to hunt it, determined to rid the city of the ghoulish menace. Frustrated as the creature continues to take victims, Kevin eventually traps and kills it, almost losing his life in the process.
But when victims begin to emerge again, Kevin is recruited by a secret faction of the Catholic Church to find out how the creature is replicating and exterminate it before it can spawn again. After frustrating false starts, distractions, and a tragic loss, Kevin closes in on his quarry, determined this time to eliminate it for good.