A plot twist: Elin Hilderbrand's letter to readers

      |"My friends say, 'You will fight, we are here, you will beat this.' And yet as anyone who has been diagnosed with cancer knows, we are all alone when it comes to our bodies. No one can alleviate the burden. It is solitary confinement," she writes. Watch Hilderbrand read her full letter out loud on this "CBS This Morning" extra.