Lonely, cheerful mommy blogger Stephanie (Anna Kendrick) becomes obsessed with Emily (Blake Lively), the chic, mysterious new mother to the neighborhood. When Emily disappears, Stephanie pieces together clues left behind by her friend while also caring for Emily's son, Nicky, and unwisely getting involved with Emily's handsome yet suspicious husband Sean (Henry Golding). Directed by Paul Feig. Based on Darcey Bell's 2017 novel of the same name.