 The anonymous letter that Grace sends to the Organ Donor Liaison,  and that Bob reads in the back of his truck, says: "Dear Donor  Family: I hope this letter may be of some comfort, although words  cannot express the depth of my gratitude. I am eternally grateful  for the thoughtfulness you and your loved ones have given me in your  moment of deepest sorrow. I awake each day feeling the gentle rhythm  of the heart that beats inside me. It is because of you I am alive  today. You will always be in my thoughts and prayers. I thank you  and God bless."