At the end of her life, Catherine, the cast-off wife of Charles Dickens, gave the letters she had received from her husband to their daughter Kate, asking her to donate them to the British Museum, "so the world may know that he loved me once." The incredible vulnerability and heartache evident beneath the surface of this remark inspired Gaynor Arnold to write Girl in a Blue Dress , a dazzling debut novel inspired by the life of this tragic yet devoted...