Sandy, Dan and Peter are three affluent, spoiled teens spending a lazy summer on Fire Island, N.Y. Both boys pepper Sandy with sexual advances, which she clearly relishes. Into their tight triangle comes chubby and naive Rhoda . Like the injured seagull Sandy both nurtures and tortures, Rhoda becomes a figure of sport, teased and humiliated by the group. Sandy's cruelty and influence brings the summer to a shocking climax.