Mercedes Bryce Morgan’s horror film “Bone Lake” announces itself with a startlingly cheeky opener and closes with a shockingly bloody gore-fest, the song “Sex and Violence” by U.K. punk outfit the Exploited spelling out the thesis of the film for us. It’s about the intertwining of sex and violence, you see. But what unfolds between these naughty, viscera-drenched bookends is less of a traditional horror film and more of a psychosexual thriller, like “Funny Games” played between two, young attractive couples, with a setup borrowed from “Barbarian.”

In the script by Joshua Friedlander, a double-booking of a secluded rental mansion becomes a double date when Will (Alex Roe) and Cin (Andra Nechita) stumble in on the intimate weekend vacay of Sage (Maddie Hasson) and Diego (Marco Pigossi). The

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