Twelve-year-old kit (with a small k) likes shopping at the flea market with her best friend, Clem, roller-skating, climbing to the roof to look at the stars, and volunteering at an animal shelter. Until suddenly she has a really big, really strange secret that makes life more complicated than she's prepared for: Sometimes, without warning, she turns into a tiny naked mole rat.

It first happened as kit watched Clem fall and get hurt during a performance with her acrobatic-troupe family on TV. Since then, the transformations keep coming. Kit can't tell Clem, because Clem hasn't been herself after the accident. She's mad and gloomy and keeping a secret of her own: the real reason she fell.

Months later, kit and Clem still haven't figured out how to deal with all the ways they have changed--both inside and out. Somehow, kit has to save the day. But she's no hero, and turning into a naked mole rat isn't a superpower. Or is it?