When Terry Griffith loses her high school's writing competition, she's convinced that it's because she's a girl. So Terry decides to change high schools and pose as a boy to prove her point. Her brother, Buddy, helps her pass as a guy so well that she is soon making friends with the boys at school, including the attractive Rick, who becomes her new best friend. But her gender-swapping makes things difficult when she falls in love with him.
Overprotective mother Liz Benedict meets 18-year-old orphan Joanna Redwine and hires her as house help and live-in companion to rambunctious daughter Tara. Liz's husband Jeff isn't too thrilled with the arrangement, and his fears soon prove justified when Joanna begins to manipulate everyone and to slowly destroy the family. Meanwhile, next-door neighbor Dr. Linquist investigates and discovers Joanna has a disturbing past.