Jack Sadelstein, a successful advertising executive in Los Angeles with a beautiful wife and kids, dreads one event each year: the Thanksgiving visit of his twin sister Jill. Jill's neediness and passive-aggressiveness is maddening to Jack, turning his normally tranquil life upside down.

An innocent college couple unknowingly become involved in their Professor's illicit research into the manipulation of love and his recreation of the elusive "Cupid's Arrow".

FBI agent Malcolm Turner and his 17-year-old son Trent go undercover at an all-girls performing arts school after Trent witnesses a murder. Posing as Big Momma and Charmaine, they must find the murderer before he finds them.