Cilla and Tina are thirteen years old and identical twin sisters. As they hurry to catch the bus to school one day, Cilla is run over by a car and killed. Left behind is Tina, who now has to find her balance in life without her sister. The book follows the sisters during the months leading up to Cilla's death, and Tina's first year without her.
Kinna Gieth and her twin sister Jenny read Peter Pohl's novel Alltid den där Annette, in which Annette loses her twin. While reading it, Kinna and Jenny talked about how neither one of them would be able to go on living if the other died. Just weeks later Jenny died, and Kinna contacted Pohl and asked him to help her write their story. Pohl used Kinna's letters, poems written by the twins and their diaries, and conversations with Kinna to form the basis of the book