Andrea and Ryan's 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 a letter from an old lover of Donna's is found hidden in her room. They discover they have an older brother and question why their mother never mentioned him. Curiosity leads the twins to leave London and head south to a Sussex village in search of their long-lost brother and the answers to the many questions surrounding their turbulent family history.