James McConnell's one wish is that his nine-year-old son will finally be healthy enough to play a game of catch. Then he and his wife, Emily, receive news they've dreaded: Aaron's cancer has relapsed. As the family steels themselves for a draining treatment regimen in yet another hospital, Aaron receives the gift of a lifetime--a personal visit from one of his favorite professional baseball players--and the chance to make a bold request, his wish:...