Returning home from a business trip, an architect assumes that a client is having an affair with his wife and murders the man. His feelings of guilt and attempts to conceal the crime lead to more complications and death.

18-year-old Sean's first summer after completing high school is much spent with 28-year-old teacher Diane, who's husband is too often motorcycle-racing instead of with her. Wacko Ralph also has "the hots" for Diane; and it doesn't help that Sean was with Ralph's younger brother, Lou, when Lou died