Lulu Mayfield has spent the last five years molding herself into the perfect 1950s housewife. Despite the tragic memories that haunt her and the weight of exhausting expectations, she keeps her husband happy, her household running, and her gelatin salads the talk of the neighborhood. But after she gives birth to her second child, Lulu’s carefully crafted life begins to unravel.

When a new neighbor, Bitsy, moves in, Lulu suspects that something darker lurks behind the woman’s constant smile. As her fixation on Bitsy deepens, Lulu is drawn into a web of unsettling truths that threaten to expose the cracks in her own life. The more she uncovers about Bitsy, the more she questions everything she thought she knew―and soon, others begin questioning her sanity. But is Lulu truly losing her mind? Or is she on the verge of discovering a reality too terrifying to accept?