Ben Burns (Lucas Hedges
), 19, unexpectedly returns to his family’s suburban home on Christmas Eve. Ben’s mother, Holly (Julia Roberts
), is thrilled to welcome him home. His teenage sister, Ivy (Kathryn Newton
) and stepfather Neal (Courtney B. Vance
), are wary.
Although Ben claims he's clean now, Holly is worried that Ben is still using drugs and keeps a watchful eye on her son, to the point of hiding her prescription drugs and asking Ben to leave the bathroom door open. Over a turbulent 24 hours, new truths are revealed, and a mother’s undying love for her son is tested as she does everything in her power to keep him safe.