The main storyline focuses on Andrea and Ryan, a brother and sister, whose lives are upturned when their mother suddenly dies. Donna had never caused anything but chaos, but now they feel lost without her. However, everything changes when they are going through her personal belongings and they discover a letter from an old lover of Donna's. They discover they have an older brother and question why their mother never mentioned him, so curiosity leads them to leave London and head south to a Sussex town in search of their long lost brother and the answers to the many questions surrounding their turbulent family history.