Miriam has selflessly cared for her father in their family home with the help of a creepily polite nurse, Alice, during his final years. As soon as he's found dead, Miriam's older sister, Annabel, returns after thirty years in Tasmania to learn that Daddy has left the bulk of his fortune to Miriam. When Alice complains to Annabel that Miriam has unfairly fired her, she blackmails Annabel by claiming to have evidence that Miriam did, in fact, murder the old man. However, Miriam and Annabel join forces against their blackmailer, and before too long, Alice's body is hurtling down an old abandoned well. But that's when the nightmare really begins.