Eleven-year-old Sierra Malkens walks into school one day to find that her entire life is just a little bit different. Her friends, her teacher?everyone is different, but only sort of. Then a strange boy named Tom reveals to her that they?re stuck?in another dimension. Sierra has somehow switched places with her twin from a different universe, and it?s about to get very weird. In this novel for middle readers, a girl trapped in another dimension must work with a boy who is also stuck so that they can find their way home.