The series will pick up in 1871, 30 years after the events depicted in the series, "Belgravia" which was written by Julian Fellowes (Downton Abbey). Developed and written by Helen Edmundson (Dalgliesh, Mary Magdalene), it will tell the love story of Frederick Trenchard, who has grown up as the third Lord Glanville, and his new love interest, Clara Dunn, who is a newcomer to London society. Unaware that his birth was the product of an affair between his mother Susan and the scoundrel John Bellasis, a troubled childhood has left Frederick deeply insecure, which challenges his courtship of and marriage to Clara.