Wish Upon a Star is a novel in the Teens of Silver Hills franchise, written by Maryam Wells, and starring real-life sisters. It focuses on two teenage sisters in the early 2000's decade, that magically swap bodies because of a wish made on a shooting star. They spend several days living each other's life, sometimes with the intent to sabotage the other's reputation and achievements, but they learn to appreciate and help each other along the way. The tagline to this movie is "I Wish I May, I Wish I Might, Become My Sister For A Night!"
In 2000, the two Ferguson sisters share a household and a high school in Silver Hills, California, but both feel that they have little else in common. 17-year-old senior, Taylor's days revolve around being popular, dressing stylishly, and spending time with her jock boyfriend, while exerting minimal effort academically. While 15-year-old sophomore Kylie is socially reserved, admiring her older sister's popularity from a distance while excelling in her studies, particularly science and mathematics. Taylor and Kylie don't get along well at all, with Kylie resenting her reliance on her frequently late sister for a ride to school and Taylor preferring not to be seen with her less-than-cool younger sister.
One night, Kylie is outside studying the night sky for her science class, while Kylie relaxes in the outdoor hot tub with her boyfriend, Kyle (Don Jeffcoat). When Kylie sees a shooting star, she wishes aloud to become her sister Taylor, then turns to see Taylor also watching the sky. The two of them awaken the next morning to find themselves trapped in each other's body. Kylie assumes responsibility for the swap, mentioning her wish.
Distraught, Taylor forbids Kylie to go to school in her place, and she instigates a variety of wish-making attempts for Hayley to reverse their condition, all of which are unsuccessful. Kylie is content to fill her sister's role for the day, as she can now experience the glamour of Taylor's life firsthand.
After the first day ends, they realize that they may be stuck like this for a while. They each spend the next few days purposely trying to ruin anything important to the other, such as their social reputation and extra-curricular activities. One day, Kylie (in Taylor's body) wears the same outfit that she had worn the day before, and Taylor (in Kylie's body) goes to school dressed up as a dominatrix.
Their parents choose not to interfere, as they had just started a "hands-off" approach to parenting. Eventually the sisters learn to look at their lives with new perspective. As they each become accustomed to the other's life, they begin to relate to one another better and become closer as sisters.
While spending an evening outside searching for a shooting star to make their wish to switch back, they decide to spend one more day as each other. Kylie's task (in Taylor's body) is to help convince her teachers that Taylor is not an "airhead," and Taylor (in Kylie's body) is to help show Kylie how easily she can get a guy.
The girls' plans work, and they decide that it's time for them to switch back. As they lay outside watching for a shooting star, they fall asleep early; Kylie wakes up during the night in time to wish on a star. When she awakens the next morning, she finds that they didn't switch back and believes that they will never be able to return to their own bodies, but she doesn't tell Taylor.
The sisters attend the Winter Festival dance, where Kylie breaks down and tells Taylor that they can't switch back. Alexia then confesses that she saw the first shooting star when she was with Kylie and wished to be Taylor, since she had been jealous of Kylie's intellect and well-structured plans for her future.
Realizing that it was their combined wishing that caused their switch, they sit outside and, seeing a shooting star, wish together to be themselves again. Opening their eyes, they are delighted to see their wish has come true. They return to the Winter Festival, where Taylor is crowned queen. She then dances on stage with her boyfriend, while Kylie finds their new neighbor Simon and dances with him.
- Taylor Fergurson, the older sister of Kylie, who is in Kylie's body.
- Kylie Fergurson, the younger sister of Taylor, who is in Taylor's body.
- Seth Harding, Taylor's Boyfriend
- Benjamin "Ben" Fergurson, Taylor and Kylie's father, deceased
- Mary Fergurson - Taylor and Kylie's widowed mother
- Lois Chiles - Principal Mittermiller
- Ivey Lloyd - Caitlin Sheinbaum
- Matt Barker - Simon
- Jacque Gray - Kazumi