Twelve-year-old Sarah Willis begins to see another version of herself in an alternate universe living a (totally weird) parallel life.
As she grows older, Sarah becomes dissatisfied with her mundane, academic life and envious of the wonderfully reckless, daring, and romantic experiences Other Sarah, who becomes a theater director, has.
Risking her reputable career in teaching and her last shred of dignity, Sarah seeks to make their two lives converge by developing relationships with the her-world counterparts of Other Sarah's friends and family.
When she gets overly invested in the lives of Other Sarah's ex and his children, Sarah makes many foolish decisions that threaten to tear both Sarah's worlds apart.
Faced with losing the only life she's ever actually lived can Sarah make things right and give up the dream of living her other life?