This is an incredible book.  Kehret has the reader hooked within the first few pages.  I actually got queasy reading about how polio took over her 12 year old body.  Little Peg is moved from hospital to hospital as the symptoms from polio overtake her.  The reader watches as her fever eventually subsides, she is taken out of an iron lung, and she is subjected to therapy treatments that seem nothing short of torture.  The most touching part of the book are the friendships that she makes in the hospital.  Recommend for grades 4+