Based on the best-selling book by St John Greene, the true story of Singe (Rafe Spall) and Kate (Emilia Fox), a couple from North Somerset whose lives are turned upside down when Kate is diagnosed with an incurable breast cancer. Over her last few days she creates 'Mum's List', writing her thoughts, wishes and memories down, to help the man she loves create the best life possible for their sons after she is gone.