Grace and Jonathan Fraser are living an idyllic life on the Upper East Side of Manhattan. In preparation for a fundraiser at their son Henry's private school, Grace co-chairs the school's auction committee and notes the other mothers' prickly treatment of Elena, a young mom who's new to the group. The night of the Fundraiser, Grace tries to comfort an inconsolable Elena, while Jonathan departs for a medical conference early the next morning. As Grace awaits Jonathan's return, she's blindsided by news of a tragedy within the school community.

Grace hears Jonathan's side of the story and finds herself being followed by someone close to Elena.