It's hard to keep close a person everyone keeps telling you is gone.

It's been sixty-five days since the accident that killed Juniper`s sister, and ripped Juniper`s world apart.

Then she discovers the letter: written by Camilla on the day of the accident, addressed mysteriously to 'YOU', but never sent. Desperate to identify Camilla`s secret love and deliver the message, Juniper starts to investigate.

Until she loses something. A card from The Happiness Index: little notecards on which she rates the day. The Index has been holding Juniper together since Camilla`s death - but a lost card only widens the hole she left behind. 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.