The secrets that might save a nation could shatter a marriage.

Madly in love, Diana Foyle and Brent Somerville married in London as the bombs of World War II dropped on their beloved city. Without time for a honeymoon, the couple spent the next four years apart. Diana, an architectural historian, took a top-secret intelligence post at Bletchley Park. Brent, a professor of theology at King’s College, believed his wife was working for the Foreign Office as a translator when he was injured in an attack on the European front.

Now that the war is over, the Somervilles’ long-anticipated reunion is strained by everything they cannot speak of. Diana’s extensive knowledge of London’s churches could help bring down a Russian agent named Eternity. She’s eager to help MI6 thwart Communist efforts to start a new war, but because of the Official Secrets Act, Diana can’t tell Brent the truth about her work.