When a series of ritualistic murders strike New York City, each staged with chilling theological precision, the NYPD turns to the only man who might understand the message beneath the blood: former divinity scholar turned criminal profiler, Dr. Mathias Green. Haunted by a past he refuses to examine and a mind he can’t always trust, Mathias is pulled into a twisted game of scripture and symbolism. As the killer, known only as Psalmist13, turns doctrine into death, Mathias begins to realize the crimes mirror not just the Psalm—but his own teachings. With the help of no-nonsense NYPD Captain Julia Halpern and tech analyst Lennox Rivera, Mathias must descend into the city’s literal and metaphorical underworld to uncover the truth, but the deeper he goes, the more he must confront the legacy he left behind—and the students who never forgot what he taught them. Philosophy becomes prophecy. Academia becomes weapon. And the final verse is still unwritten.