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Before high school starts, Luna and her friends Mimi and Samantha spend the day at the mall where Luna's mother runs the local movie theater. When Samantha shoplifts a lot of electronics equipment, she has Luna literally hold the bag, and take the blame for the theft. Samantha's lawyer mother comes and pays a $3,000 fine, but since Samantha won't tell her the truth, her mother expects Luna to pay her back. Luna's father is dead, and her mother's immigration status is still in process, so there's no way she can pay back that much money. Not only that, but she feels betrayed. The most popular social media outlet at El Dorado high school is Limbo, and when Luna realizes she has an incriminating video of Samantha, she sends it to a couple of friends... who eventually post it on Limbo, where it goes viral. Samantha is upset, and when she does something drastic, Luna regrets her actions. Because Limbo is linked to all of the drama at the high school, officials arrive from the company with a way to help repair the culture. They institute a Retro Challenge, where teens have to promise to use only technology available before the first smart phone, in about 2000. Because the prize in the competition is a college scholarship and money is tight, Luna enthusiastically takes it on. Teens are also encouraged to wear vintage clothes and listen to old music on Walkmans, but there aren't a lot of teens who can separate from their phones. There are a bunch of noncompetitors who start to enjoy the lifestyle, called Retromaniacs, who start to hang out at the mall. The movie theater starts doing much better, which is good because there are developers who want to tear down the failing structure to build apartments. There is a dark side to the Retro challenge, however, and when girls (including Mimi) go missing, Luna starts to question Limbo and everything connected to the challenge. Can any of what's happening at her school end well?