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 Will's carefully planned-out life? Not so certain, either. Newbery Medalist Jerry Spinelli tips Will's world on its side to show that the beauty and wonder of life is in not knowing what comes next.
Will Tuppence's life has always been ruled by science and common sense but in ninth grade, shaken up by the discovery that protons decay, he begins to see the entire world differently and gains new perspective on his relationships with his little sister and two close friends.