Millie is hired as a housemaid for Douglas and Wendy Garrick in their upper west side penthouse. Soon, she notices unsettling signs, including blood stains on Wendy's nightgown and bruises on her face, suggesting Douglas might be an abuser. Dedicated to helping women in such situations, Millie makes a promise to intervene. However, the situation is more complex than it appears, leading to accusations of murder and a shocking twist as the story switches perspective to reveal Wendy's sinister side and a deeper conspiracy involving an affair and deadly revenge.