'ANGELS AND Mortals, Believers and Nonbelievers, look heavenward,' Maya Angelou writes, 'and speak the word aloud. Peace.' Angelou's moving poem is a radiant affirmation of the goodness of humanity. First read at the 2005 White House tree-lighting ceremony, it comes alive again as a fully illustrated children's book, celebrating the promise of peace in the holiday season. In this simple story, a family joins with their community - rich and poor, black and white, Muslim and Jew - to celebrate the holidays.