A mother's promise to her little girl that when the new baby arrives, 'life will not change, only get better'. The mother - Sarah - pours her heart into seven letters, one for every word. Five months into her pregnancy Sarah collapses and the beautiful life she dreamt of turns into a nightmare. With Sarah's future, and the future of her pregnancy, in their hands, her husband and sister fiercely disagree about what the doctors should do. And the crisis reveals devastating fault-lines in the lives of the entire family. All the time the clock is ticking. The medics need a decision...