After a meteor hits the moon and sets off a series of horrific climate changes, seventeen-year-old Alex Morales must take care of his sisters alone in the chaos of New York City.

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 closest friends.