When ancient parasites rise from beneath a small town, taking the most fearful and susceptible as hosts, a young trans filmmaker finds herself the only one who can sense the possessed, and rally the resistance before the horror escapes and spreads.

A wearer of a parasitic mask with black magic sheds blood on Halloween. 16 years later, a killer with the same profile slaughters Angel's friend, who then must fight fear, overcome personal struggles and unmask the murderer before someone else dies.

When her carefully ordered holiday routine is disrupted by her free-spirited sister's sudden return and wedding plans, a guarded woman must navigate tangled emotions, family chaos, and unexpected connection in the lead-up to Christmas Eve.