Abby and David Treasure of Jackson Hole, Wyoming, seem to have everything: the perfect marriage, a perfect son, a perfect life. A phone call is about to change all that. Years before David secretly had an affair and, although he never knew it, fathered a daughter. Now a voice from the past tells him the little girl is deathly ill and her only hope is a bone marrow transplant - from Abby & David's son.