When their baby boy falls ill, Miguel Sancho and Felicia Morton are plunged into chaos. Determined to keep their son, Sebastian, alive, their marriage intact, and themselves sane, they begin a quest for a cure that leads them deep inside the workings of the immune system and to the cutting edge of modern medicine. This is a story about heroes as well as science-the community of anguished parents, daring doctors, loving nurses, and compassionate counselors who are united in the supreme struggle to save the lives of innocent children. By the time he makes it triumphantly home, Sebastian and his family have both been permanently transformed-Sebastian at the molecular level and his family in ways they never could have imagined. Book jacket.