Here is how the author introduces the plot on page 7, after the initial high school setting has been established:

You know how they say everyone has a “twin” somewhere in the world, a person chance has formed to be their mirror image? Mine happens to be rock star Kari Kingsley. Our faces are eerily identical…. When Kari’s first album came out and her face popped up everywhere I thought I was lucky to resemble her. She’s beautiful, confident, and oozes sultriness. But then she opened her mouth and started speaking to reporters…. Suddenly I was stupid by association.

After a prank photo of Alexia goes viral, Kari and her manager, Maren Pomeroy, recruit Alexia to serve as Kari’s double in California, so Kari won’t always sound dumb in interviews, and so Kari can occasionally escape the glare of publicity and work on her next album while Alexia covers for her at events. At first Alexia has no intention of going, but a conversation with her mother triggers a reversal of determination; and when Alexia realizes that she and Kari are half-sisters, going to California will mean meeting the father she never knew.

But Kari is more fragile than Alexia realized, and she has to cover for more than Kari’s social gaffes. To make the situation excruciatingly difficult, Alexia begins to fall in love with an unfriend of Kari’s, and paparazzi threaten to reveal details of her private life that will be interpreted as Alexia’s actions.

Rallison’s writing is often humorous, with good descriptive details, and she can acknowledge the reality of social issues without getting mired is social commentary. This book is for young adult readers who like happy endings and just deserts. – Chris Paige