Mercedes Bryce Morgan is honing her skillset as a psychosexual horror filmmaker, first with Shudder’s Spoonful of Sugar, and now with the festival title Bone Lake. Her second collaboration with actress Maddie Hasson follows in the footsteps of rental thrillers like The Rental or Superhost, except with a horned-up twist. Fidelity and fairy tales are tested in a game of sensual wits as writer Joshua Friedlander explores what would happen if Cupid scripted Speak No Evil. An awkward social scenario requires some suspended belief upon arrival, but as players begin breaking normalized behavioral rules, Bone Lake becomes a scintillating competition filled with dangerous temptations.

Aspiring author Diego (Marco Pigossi) and his supportive journalist girlfriend Sage (Maddie Hasson) rent a lavish estate for a much-needed lover’s getaway. When they arrive, they’re met with a complication — a double booking. Vacationers Will (Alex Roe) and Cinnamon (Andra Nechita), “Cin” for short,...