Reeling from the unexpected death of her husband, Beth is left alone in the lakeside home he built for her. Soon she begins to uncover her recently deceased husband's disturbing secrets.
When Sarah lucks into a sweet one-bedroom at Asilo Del Mar Apartments in Los Angeles, she thinks she's hit the jackpot. It's got plenty of space, friendly tenants, group BBQs and even a cute neighbour next door. All is not what it seems: loud noises start keeping her awake at night; her cat is missing; everyone seems to be a little too helpful and friendly, except for the weirdo, Lester. Soon, Sarah learns she didn't choose this apartment — it chose her.
A documentary filmmaker turns his lens on an enigmatic conspiracy theorist who claims he's found the entrance to a vast underground city populated entirely by monsters.