Triangle Films co-founder Kathryn Annelle makes a directorial breakthrough with River Rock Women's Prison, her company's first full-on feature, and one sure to hit like lightning among the bona fide lesbian community.

Mining the always-ripe milieu of (as the title connotes) the '70s women's prison exploitation flick, River Rock serves as a perfect stage for Annelle's darkest and most ferocious sexual flights of fancy. And with the collaborative aid of alt mad hatter Octavio Winkytiki (who helped design, shoot and edit this), she's crafted a real treat for those who like their lez fare raw and real.

Dia Zerva narrates the loose, disjointed tale of an attempted break from the titular joint spearheaded by herself and on-the-rise butch lesbian sensation Syd Blakovich. Claire Adams plays the bitchy warden who afflicts guard Adrianna Nicole with a case of Stockholm Syndrome. And Melissa Monet disappears into the role of "Madam," the predator of the inmate community who takes "fresh fish" Justine Joli under her wing.

Every sex scene is pretty intense, but the one between Monet and Joli is downright unforgettable, with the timid Joli succumbing to Monet's aggressive groping and eventually giving back as ravenously as she's getting.

When Adams looses herself upon Zerva at the end, meanwhile, it's a trip to the extreme end of the spectrum, beginning with Zerva getting whipped, spit on and verbally flogged by Adams while suspended in intricate rope bindings, after which the cruel warden clamps her face, breasts and pussy with dozens of clothespins before taking her brutally from behind with a strap-on.

River Rock Women's Prison definitely is not for those who like their g/g glam and pretty, but it stands to become an instant lesbian cult classic.