Katie knows there's stuff that makes her different She's homeschooled, she has freckles, and her teeth are crooked. But none of that matters to Kacey! They're best friends forever-just like their necklaces say. But when they go to camp, Kacey starts acting weird. What happened to "forever"? And when Katie gets home, she can't stop worrying About braces. About sixth grade. About friends. She kno…