Kate and Marylin have always been the kind of best friends who don't need words to talk to one another; they always just knew what the other was thinking. But lately it's starting to feel as though they don't know each other at all anymore. Marylin decides Kate (who still chases fireflies!) still acts like a baby, while Kate doesn't understand Marylin's new obsession with painting her toenails or wanting to be a cheerleader (and becoming on eof those people who only thinks about her hair!). And even though, secretly, they both wish things could be the way they were, neither one of them know how to get back there.
From the Cassette edition.
The Secret Language of Girls by Frances O'Roark Dowell