Stephanie Smothers, an enthusiastic yet lonely single mother and vlogger, befriends Emily Nelson, a sophisticated and mysterious public relations director. Their sons attend the same elementary school in Connecticut, and this connection sparks an unlikely friendship between the two contrasting women. Stephanie is captivated by Emily's glamorous lifestyle and unabashed confidence, while Emily is amused and intrigued by Stephanie's willingness to help and naive nature. The duo's bond deepens as they share secrets over martinis, and Stephanie admires Emily's seemingly perfect life with her husband, Sean, and their child.

One day, Emily asks Stephanie for a simple favor: pick her son up from school due to a work crisis. Stephanie obligingly agrees, but Emily's sudden disappearance thereafter throws her world into disarray. Concerned, Stephanie uses her vlogging platform to seek information about Emily's whereabouts. Meanwhile, she begins to dig into her friend's past, uncovering layers of complexity and secrets. As Stephanie becomes entrenched in the mystery, her relationship with Sean takes on a new dimension, leading her to question not only Emily's life but her own understanding of family, love, and trust.