The Eagle of the Ninth by Rosemary Sutcliff
One of Rosemary Sutcliff's acclaimed books set in Roman Britain. The Eagle of the Ninth tells the story of a young Roman officer who sets out to discover the truth behind the mysterious disappearance of the Ninth Legion, who marched into the mists of northern Britain and never came back. Rosemary Sutcliff spent most of her life in a wheelchair, suffering from the wasting Still's disease. She wrote her first book for children, The Queen's Story, in 1950 and went on to become a highly respected name in the field of children's literature. She received an OBE in 1975 and died at the age of 72 in 1992.