The search result for " Plank Face " (2016) is a psychological horror film about a man named Max who is abducted by a feral family living in the woods. They attempt to "break" him and transform him into a "Plank Face"—a mindless, mask-wearing companion for their own twisted group.

Slow-burn psychological horror combined with visceral body horror.

After conducting research, I found that "Plankface" is a 2016 American supernatural horror film directed by Derek Cianfrance. The movie stars Aaron Paul, Kate Mara, and Charlie Tahan. The plot revolves around a family's terrifying experience with a malevolent entity.