Allyson Williams is 18, still in school, and definitely not supposed to be in her older brother’s friend group. But one accidental group chat add changes everything. Suddenly she’s surrounded by a chaotic group of 20–24 year old guys and girls scattered across England—late-night calls, gaming sessions, parties, inside jokes, and messages that never stop coming. At first, she’s just “Jason’s little sister.” Then she becomes the girl they all talk to. The one who fights back in the chat. The one who doesn’t get intimidated. The one they start staying up for. But the group is already messy before she arrives. Enzo Moretti, Jason’s Spanish best friend, is sharp-tongued, sarcastic, and far too observant for his own good. Kai Park is soft-spoken, attentive, and somehow always the first to care too much. Mia Rivera, Enzo’s overly attached best friend, doesn’t like sharing attention. And Ryan Hughes exists just outside the group—her no-strings arrangement that refuses to stay emotionally simple. Now everything is overlapping. Jealousy in group calls. Tension in private messages. People noticing things they shouldn’t. And Allyson? She was never supposed to stay this long. But now she’s in the middle of it all—and nobody wants her to leave.