Graces Room (2016)

Billie a twenty something burnout is tasked with housesitting for her aunt and uncle but after inviting some friends over becomes convinced her teenage cousin Grace has stolen a notebook containing her latest screenplay While hunting for the book in Graces Room the gang uncovers a bloody trove of occult paraphernalia Unbeknownst to Billie and her friends said cult has been watching them from the nearby woods and now must kill them for discovering too much A gruesome assault on the house ensues as the gang struggles to survive the night