Gwen Cummins (Sandra Bullock - While You Were Sleeping, Speed) is a successful New York writer who's everyone's favorite party girl.
Life to Gwen and her boyfriend, Jasper (Dominic West), is just a fun-filled exercise in debauchery; stumbling from bar to night-club to hangover, until Gwen's alcohol-fuelled display at her sister Lily’s (Elizabeth Perkins - Crazy in Alabama, The Flintstones) wedding results in a drunk-driving charge and a court order to spend 28 days in rehab.
Determined she does not belong, Gwen refuses to conform to the unique set of rules and rituals she is faced with. It's only through the relationship she forms with the other patients and her counselor, Cornell (Steve Buscemi - Big Daddy, Desperado) that she begins to realize that there may be more to life than being the life and soul of the party.