It's hard to keep close a person everyone keeps telling you is gone. It's been sixty-five days since the accident that ripped Juniper's world apart. Life without her kind, beautiful, vibrant big sister Camilla is a colder, darker place. Until she discovers the letter. The letter Camie wrote, but never got to send. It's mysteriously addressed to 'You' and dated July 4th - the day of the accident. Desperate to learn the identity of Camie's secret love, Juniper starts to investigate. But then she loses something herself. A card from her daily ritual, The Happiness Index: little notecards on which she rates the day. The Index has been holding Juniper together since Camie's death - but without this card, there's a hole. And this particular card contains Juniper's own secret: a memory she can't let anyone else find out. An unforgettable story of love, loss, mistakes and memories.