Billie, a twenty something burnout, is tasked with house-sitting 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 "Grace's 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.

Honeycrisp tells the story of Hannah and Greta Lawton - two estranged sisters with a turbulent past who meet up to clean out their suddenly deceased parents cabin and repair - or end - their relationship.