Everything changes the day ninth-grader Will Tuppence learns one startling fact: protons-those tiny atomic particles, the building-blocks to the building-blocks of life-can die. The one thing that was so certain in this world to Will has an expiration date. And Wills carefully planned-out life? Not so certain, either. Newbery Medalist Jerry Spinelli tips Wills world on its side to show that the beauty and wonder of life is in not knowing what comes next.