When Christian learns his great-grandfather helped build the A-bombs dropped on Japan, he wants to make amends somehow. While attending the funeral of his great-grandfather, ninth-grader Christian Larkin learns that the man he loved and respected was a member of the Manhattan Project, the team that designed and created the atomic bombs dropped on Japan during the Second World War. On a school trip to Japan, Chris meets eighty-one-year-old Yuko, who was eleven when the first bomb exploded over Hiroshima, horribly injuring her. Christian is determined to do something to make up for what his great-grandfather did. But after all this time what can one teenager really do? His friends tell him it s a stupid idea, that there s "nothing" he can do. And maybe they re right. But maybe, just maybe they re wrong."