Stay-at-home mom Sarah (Winslet) and former jock Brad (Wilson), an aspiring lawyer with a young son, meet at a local park, and forge an immediate connection. Sarah is unfulfilled by life as a stroller-pusher; Brad has failed the bar twice and seems unfit for a career in law. Both need escape from isolating routine and distant spouses, and find it in each other. An exhilarating but potentially destructive affair begins. Meanwhile, neighborhood busybodies are on edge about Ronnie (Haley), a creepy sex offender who's moved in nearby with his mother.