A world where only women transform into vampires, during their monthly bloody cycle.

On a road trip to drop her daughter Ruby off at college, Sarah's car breaks down in the middle of nowhere. A passing driver, Allie, offers a ride into town for help, and though hesitant, Sarah lets Ruby go while she waits for a tow truck. But when Sarah arrives at a nearby diner to meet them, Ruby is missing, and Allie claims they've never met.

In the mysterious Siren Salon, a young woman in an abusive marriage must decide how many inches – and people – she’s willing to cut off.