Twenty years after the disappearance of her daughter, recovering alcoholic Darlene Hagen (Anna Gunn) is preparing to host her family’s Christmas celebration with her best friend Gretchen (Janeane Garofalo). Late Christmas Eve, Darlene’s estranged ex-brother-in-law, Jack (Linus Roache) arrives unannounced, bearing nostalgic gifts and a heavy secret. Soon, Darlene finds herself caught between reason and ruthless instinct. Trapped together by a dangerous storm, a battle of wits escalates to a violent game of revenge.