If you save someone's life, do you become responsible for them? When Anna receives a letter from Adam, thanking her for saving his son Max's life with a bone-marrow donation, it's the first positive thing that's happened to her for a long time. Grief-stricken at the recent loss of her baby, she's failed to give life in the past. Now this four-year-old boy is alive and healthy because of her: it's a heady realization. Anna is desperate to get to know...