Eloise McGarry attends the wedding of her oldest friend Francie Millner. It's discovered that she was originally maid of honor but "dropped out" two months ago after her ex boyfriend Teddy, the bride's brother and the best man, broke up with her by text after two years together. Teddy is now back with his old girlfriend Nikki, who has replaced Eloise as maid of honor. At the reception, Eloise discovers she has been seated at Table 19. While she considers leaving early, she meets a man named Huck who notices her looking distressed and offers words of advice which are not well received. Eloise decides to stay and meets her table mates: Jerry and Bina Kepp, Facebook friends with the groom's father who own a chain of diners; high-school-er Renzo Eckberg, whose parents are acquaintances of the groom and who came to the wedding in the hopes of meeting a girl; Jo Flanagan, Francie's childhood nanny; and Walter Thimble, the bride's cousin who is currently on parole..