Twelve-year-old Maggie knows her new baby sister who smells like powder isn't her sister for keeps. Izzie is a foster baby awaiting adoption. So in a day or a week, she'll go to her forever family and all that sweetness will be gone. Except for those things Maggie's secretly saving in the cardboard boxes in her closet and under her bed. Baby socks, binkies, and a button from Bud the Bear. Rocks, sticks, and candy wrappers. Maggie holds on tight. To her things. Her pet turtle. Her memories of Nana. And her friends. But when Maggie has to say goodbye to Izzie, and her friend gets bumped from their all-girl trapshooting squad to make room for a boy, Maggie's hoarding grows far beyond her control and she needs to find the courage to let go.