RJ and Adina enter the world as fraternal twins, one raised by old-world, controlling immigrants in El Barrio, the other sold into a religious home filled with lies and scorn. Both are sociopaths.

One is a serial killer.
Turns out, RJ's got a secret that enrages him with the flip of a switch. Adina uses her sexual power to dominate every man in her life. They are on a mysterious trajectory to cross paths in New York City, where the end of their lives culminates in an apex of horror and carnage.
"One must feel sorry for those who have strange tastes, but never insult them. Their wrong is Nature's too; they are no more responsible for having come into the world with tendencies unlike ours than are we for being born bandy-legged or well-proportioned." — Marquis de Sade, "Dialogue the Fifth," Philosophy in the Bedroom