The movie begins with Breslin investigating the murder of a young woman whose body is found in Central Park. The crime scene is unlike anything he's ever seen before, and he quickly realizes that this is no ordinary case. As he delves deeper into the investigation, he uncovers evidence of a ritualistic killing and discovers a series of symbols that seem to point to a supernatural connection.
Breslin's investigation leads him to a bookstore owned by a mysterious man named John. John seems to know more about the murders than he's letting on, and Breslin suspects that he may be involved in some way. As he continues to dig, he learns about an ancient order of horsemen who have been using dark magic to control the city for centuries.
As the murders escalate, Breslin becomes increasingly desperate to stop the killer before more people are hurt. He teams up with John and a young woman named Sarah, who also seems to be connected to the case, and together they race against time to uncover the truth and put an end to the reign of the Horsemen.
Along the way, Breslin discovers that he has a hidden power of his own, and he must learn to control it in order to defeat the Horsemen and save the city. The movie culminates in a thrilling final confrontation between Breslin and the leader of the Horsemen, as they battle for the fate of New York City.