"London, Fall 1945. Architectural historian Diana Somerville's experience as a codebreaker at Bletchley Park and her knowledge of London's churches intersect in MI6's pursuit of a Russian agent named Eternity. Diana wants nothing more than to begin again with her husband Brent after their separation during the war, but her signing of the Official Secrets Act keeps him at a distance. Brent Somerville, professor of theology at King's College, hopes...