It stars Brigitte Kali Canales as Cristina Lopez, a Mexican-American reporter who returns to her hometown near Veracruz in search of a story on witchcraft.

She is addicted to heroin and continues to inject the drug with her remaining syringes while chained to her bed, insisting that she does not have a demon inside of her.

During another ritual, Luz seems to pull animal teeth out of her abdomen, and unsuccessfully tries to extract a snake, which escapes back into her body.

Postehki is "the death god of broken things," and has inhabited her because she is chronically depressed from spending her youth in foster care and turned to heroin.

She had taken an assignment to visit her hometown planning to commit suicide via overdose at La Boca, where no one would find her, unaware the demon had drawn her there intent to finish "consuming" her.

Cristina paints her face, taking over the bruja role from Luz, and they draw out Postehki through rejecting the old ritualistic ways in favor of a more compassionate approach.

The site's critical consensus reads, "A demonic possession movie with impressive depth, The Old Ways uses familiar genre ingredients to cast a uniquely gripping spell.