<P>What does it mean to mourn today, in a culture that has largely set aside rituals that acknowledge grief? After her mother died of cancer at the age of fifty-five, Meghan O'Rourke found that nothing had prepared her for the intensity of her sorrow. In the first anguished days, she began to create a record of her interior life as a mourner, trying to capture the paradox of grief -- its monumental agony and microscopic intimacies -- an endeavor that ultimately bloomed into a profound look at how caring for her mother during her illness changed and strengthened their bond.</P><P>O'Rourke's story is one of a life gone off the rails, of how watching her mother's illness left her fundamentally altered. But it is also one of resilience, as she observes her family persevere even in the face of great loss.</P>