Pirates of Underwhere (Underwhere Series #2)

Stephanie has a whole underwear drawer full of trouble.

A week ago, Stephanie's biggest problem was finding enough time to complete her homework and study for her Mathletes competitions. Now she has to deal with magical toilet brushes, sinister talking cats, nearsighted sea serpents, feminist pirates, runty freedom fighters, and all the cottony white weirdness of Underwhere—the world beneath our own where people wear their undies on the outside of their clothes.