Maika Monroe (Longlegs) and Joe Keery (“Stranger Things”) appear together in the upcoming horror anthology Blood Covenant. Watch the trailer below.

It follows a once-promising horror writer at the lowest point of his life: years without success, drowning in debt, and on the verge of collapse. In desperation, he performs an occult ritual to summon a demon that will grant him the stories he can no longer write.

The pact works — but at a terrible cost. Each tale he creates demands a sacrifice: a pound of flesh. As his...