Kaitlyn (Elisha Cuthbert) is a high school student whose obsession with gambling leads to her accumulating a mountain of debt. Her habit also causes a high degree of family tension.
The film commences with Kaitlyn in a mathematics class. She is ecstatic because she has won a prize on a lottery ticket. It is soon revealed that Kaitlyn and her friends are saving money in order to travel to Amsterdam. Kaitlyn is a young girl who is willing to take extreme risks in order to get what she wants. She seems academically inclined. For example, she is quick to answer a question correctly even though she was not paying attention in class. She also seems to be well-respected and popular in school. For example, many of her classmates attend her birthday where they play poker and Kaitlyn manages to win the game.
Kaitlyn views the recent sequence of events as a means by which to raise money for her trip. She soon becomes involved in sporting gambling in order to make more money for her trip. Her parents view her enthusiasm for sports such as basketball and football as merely a phase. Her mother suspects that Kaitlyn watches the sports in order to watch the opposite sex. Her father, however, advises her to be cautious and to never make a bet over five dollars. He also uses Kaitlyn's new interest as a means by which to teach Kaityln's brother mathematics.
As Kaitlyn begins to lose money, she starts behaving more erratically. She steals her mother's credit card, becomes addicted to Internet gambling, neglects her personal appearance and some of her male classmates assault her physically because she did not pay them the money that she had promised. Because of this she then borrows money from a shady loan shark. The stakes increase when Kaitlyn becomes involved in illegal gambling. By this time, her life is out of control, she lies about the extent of her problems and she loses more money than she ever thought possible.
Once her parents discover the true nature of Kaitlyn's troubles, she is at the point where she is forced by the loan shark, to use her body as a means by which to overcome her debts. Her mother rescues her and Kaitlyn admits to her family how gambling has overtaken her life.
The film ends with the notion that admitting that one has a problem and obtaining help is a very different thing from actually changing one's behaviour.