In between apartments and jobs, Evelyn goes back to her hometown to house-sit her late grandmother's place. While looking for work and struggling with the malaise of her present, she tries to reconnect with old friends and feelings. But when she receives phone calls from a mysterious yet familiar voice and her present becomes harder to face, she turns to her childhood for a way out.

A '70s summer camp with a history of misogyny is hunted by a vengeful, man-eating siren that lives in the lake.