When it comes to sense and sensibility, Gwen Cummings (Bullock) lacks both. A New York writer by day and a booze-loving party-animal by night, chasing clubs and hangovers are what she does best. But when she speeds off recklessly in a limo on her sister's wedding, she loses her practical magic and gets thrown into 28 days of court-ordered rehab. With the help of her newfound friends, she blunts her cynical edge and slowly fights to reclaim her life, hoping to return to the land of the sober in 28 days.