By Andrew Clements
Grace accidentally starts a button-collecting craze that takes over the whole school — and turns her best friend into her rival.
Grace comes home with a box of old buttons and, almost by accident, sets off a collecting craze that sweeps her sixth grade. It's fun until it isn't: her best friend Ellie wants to win as badly as Grace does, and the contest turns two best friends into competitors who can't quite look at each other.
This is the friendship falling-out told without a villain — no mean-girl clique, just two good friends who both want the same thing and let it come between them. That makes it a safe, recognizable mirror for the everyday version of the ache: not betrayal, but rivalry, pride, and the trouble of saying sorry first. Clements keeps it light and clever, with a real problem to solve, so your child gets a proper story and not a lecture.