In every group of friends there is a leader, the one who brings the group together and encourages them to celebrate the friendship they share. Rachel Braun was that leader, the inspiration to her group of friends - the one who lived each day to the fullest, the life of the party - until her life was cut tragically and unexpectedly short. While her friends are coming to terms with the trauma of losing her, they each receive a letter from her out of the blue, asking them for a favour and challenging them to face their biggest fears. Sarah, an international relief worker, must travel halfway around the world to track down the only man she ever loved. Stay-at-home mum Kate must confront her fear of heights by skydiving and, by doing so, discover new truths about her marriage. And Jo, a media mogul once voted 'least likely to breed', is given the most terrifying assignment of all. Through her final letters, Sarah, Kate and Jo discover that their lives are enriched by a friend who, in many ways, knew them better than they knew themselves. Even as these women mourn and miss their beloved Rachel, her legacy lives on in the hope she kindles in their hearts.