The story centers on George, a father dealing with diabetes, who relocates to live next to his daughter, Zoe Dalton. Zoe appears to lead a perfect life with her accomplished husband, Chris. However, the dynamic in their home takes a disturbing turn when they employ Sandrine, an enchanting young woman from France, as their au pair. Her presence stirs up instincts and doubts, suggesting that there may be ulterior motives at play.