Millie (Sydney Sweeney), recently released on parole and living out of her car, seeks employment as a housekeeper for the affluent Wentworth family. Following an initial encounter with the seemingly friendly Nina (Amanda Seyfried), she anticipates rejection; however, she finds herself unexpectedly installed in a comfortable attic room—complete with central heating and a phone linked to an unlimited credit card—within the Wentworth’s lavish kitchen. It's then that Andrew (Brandon Skelnar), her husband, and their somewhat reserved, ballet-dancing daughter, Cece (Indiana Elle), enter the picture, welcoming Millie into their home. The following morning reveals a less polished side of her employer, setting off a series of unusual events that initially lead down a familiar path. With an hour still remaining, it’s clear that some surprises are in store. These twists do indeed arrive and, while they stretch believability, they're skillfully woven together with dramatic displays, deception, infidelity, and characters who aren't what they seem. The film also playfully satirizes the superficiality of wealthy social circles, a fantasy for therapists everywhere, and the three performers give solid performances, particularly as the story takes some unexpected directions later on. I didn’t anticipate it, but I ended up enjoying this quite a bit, and if there isn't another one made, I’ll be surprised.

Source on TMDB