Lexi Luna is having a relaxing day when Nia Nacci shows up at her door. Nia is a friend of Lexi’s little sister, though it seems like there’s trouble in paradise. It’s just that Lexi’s little sister is super competitive and Nia’s getting tired of her poor sportsmanship. Nia noticed that her friend suddenly got really good at pool after being taught by Lexi, so would Lexi be willing to teach HER how to play pool, too??