When Holly (Julia Roberts) returns home from Christmas shopping, she finds on the stairs an unexpected guest - her son Ben (Lucas Hedges), who should not have left the detox facility. A loving mother, despite her fears, welcomes him with open arms. He hopes Ben is "clean" and will be able to enjoy Christmas with him and the rest of the family.
It turns out, however, that Ben's visit may cause serious problems. During the next 24 hours, which can change their lives forever, Holly will do anything to save her beloved child.