We are then introduced to Leon, a vegan photographer who heads into the city's subway system at night to take photographs. He is criticized constantly by other photographers for fleeing danger before shooting a full reel. One night, in a decision to break this trend, he saves a woman from a gang that is abusing her. The next day, he discovers this girl has gone missing. Leon is intrigued by the mystery, and begins to investigate newsreels about similar disappearances. His investigation leads him to a butcher named Mahogany, who he suspects has been killing subway passengers for as long as a hundred years.
Leon attempts to turn some of the photos he has taken of Mahogany in to the police, but they refuse to believe him, and instead cast suspicion on his own motives in photographing the victims. Leon's involvement quickly turns into a dark obsession, upsetting his waitress girlfriend Maya, who is as disbelieving of his story as the police chief. Leon takes matters into his own hands, entering the subway train at midnight, only to witness a shocking bloodbath, as the butcher kills several passengers, then hangs them on meat hooks. Passing out on the subway floor, he awakes the next morning in a slaughterhouse with strange markings carved into his chest.
A concerned Maya and her friend Jurgis, a short-order cook, begin to examine the photos Leon has been taking of Mahogany, leading them to the killer's apartment. After breaking and entering the butcher's home, Jurgis is captured, and brutally killed. Maya goes to the police, But finds that they are as unwilling to consider her story, as they were of Leon's. It is at this point that we begin to discover that the police may be involved in the cover-up of Mahogany's crimes. A police official directs the misguided Maya to a trip on the midnight train. Leon, unaware of Maya's involvement, finally decides to put an end to the butcher's crimes, and heads to the hidden subway entrance in the slaughterhouse, arming himself with the a butcher's apron, and several slaughterhouse knives.
