Is God Is

Twin sisters Racine and Anaia have been left disfigured in a fire started by their father when they were children; Racine's entire left arm is scarred, while Anaia's injuries are mostly on her face and chest. Racine receives a letter from their mother, who they thought died in the fire. They drive cross-country to meet their mother, whom Racine refers to as god since she created the two of them, on her deathbed. God admits that she left them to foster care to prevent further traumatizing them, and reveals that their father, against whom she had a restraining order, broke into their house and choked her unconscious in the bathroom before bringing the twins in and setting god ablaze in front of them; the two acquired their injuries while trying to help her. God then requests that they kill their father so she can know peace before she dies. When the twins hesitate, her aides pull back her sheets, revealing the extent of her injuries, which persuades Racine.

Following god's instructions, the twins find Divine, a woman their father had a tryst with after his trial. They meet Divine's son Ezekiel and learn that their father left a pregnant Divine shortly after he was acquitted, and that Divine has been waiting for his return ever since. Racine derides her for waiting so long for an abusive man who abandoned her, leading an offended Divine to eject them; before they leave, Racine steals an address book that belonged to their father.

Using the book, they travel to the office of their father's lawyer, Chuck Hall. Communicating via whiteboard, Chuck urges them to abandon their quest, but when Racine refuses, Chuck reveals that their father ripped out Chuck's tongue to prevent Chuck from warning others about him. He then tells them their father has twin sons, and directs them to his new family.

As they stop off the side of the road, a helmeted motorcyclist destroys their car engine with a hammer before pursuing them into an abandoned construction site. The twins eventually subdue him and realize it is Ezekiel, trying to save his father. With their car damaged, the twins travel to their father's house via bus.

The twins accost his current wife Angie, who he also abuses, as she is attempting to flee to Las Vegas before their father returns. Angie turns from sympathetic to scornful when the twins refuse to let her leave, ultimately spitting in Racine's face, leading Racine to beat her to death. A horrified Anaia begs Racine to not kill anyone else besides their father. At their father's house, his sons Riley and Scotch assume the girls are strippers sent by their father for their approaching birthday. The girls play into this to gain access to the house; as they dress up, Anaia reveals that she is pregnant by an older man she met online. When they perform for the boys, Scotch insults Anaia's facial deformities. Racine seduces him before vengefully bludgeoning him. As Anaia attempts to bond with Riley, Scotch stumbles out and bleeds to death. Anaia stops Racine from killing Riley before fleeing with him. Outside, Riley begins to choke Anaia. Racine intervenes, and the ensuing fight culminates in Anaia stabbing him with hedge clippers and pushing him into the pool as he strangles Racine. Hearing their father return home, Anaia drags the unconscious Racine inside and attempts to hide.

Their father finds Anaia and informs her that their mother grabbed them after he set her alight, leading to their injuries, and promises he would never harm his children. He persuades Anaia to discard her weapon before assaulting her. Anaia prepares to fight him as a recovered Racine attacks him from behind. The twins pursue him into a bathroom, push him into the tub, pour liquor on him, and set him ablaze. As they turn to leave, he grabs Racine and pulls her into the fire with him, killing her.

Anaia mourns her sister in front of the ruins of the house the next morning, before discarding her weapon and returning home, vowing to tell her baby about Racine.