A creative young girl breathes new life into a cardboard box in this “gleeful little story of imaginative play” for fans of Harriet the Spy and Harold and the Purple Crayon (School Library Journal) The day the refrigerator arrives in its large brown carton, Christina Katerina and her mother are both excited, but for very different reasons. Christina quickly claims the box, where she creates a castle, a clubhouse, and other fantastic playthings with her sometimes-friend and neighbor, Fats Watson. Together, they embark on countless hours of adventure, swearing their undying friendship—and waging furious battles, too! “One of the classic characters of children’s literature,” the spunky and playful Christina Katerina has inspired young readers to embrace their creativity since 1971 (Kirkus Reviews). A staple in classrooms and libraries, this classic children’s book is a timeless ode to the power of a child’s imagination—and to the beauty that can be found in even the most ordinary of objects.