"They've closed off our way into Shark, Tom. They've blacked us out again." Chapter 1, Part 3, p. 34

"Bletchley didn't use human beings. It used bombes." Chapter 2, Part 2, p. 62

"These signals had never been broken. Their secrets were intact. They were virgin." Chapter 4, Part 2, p. 136

"My daughter's movements are as much a mystery to me as they seem to be to you." Chapter 4, Part 2, p. 155

"As quiet as the grave." Chapter 4, Part 4, p. 168

"'The secret things belong unto the Lord our God.' (Deuteronomy 29: 29)." Chapter 5, Part 2, p. 219

"There's always someone else." Chapter 5, Part 2, p. 225

"A girl like Claire would probably see more operational detail about the German armed forces than Adolph Hitler." Chapter 5, Part 4, p. 257

"She stole the cryptograms to read them." Chapter 5, Part 4, p. 257

"Later it would transpire that Bletchley Park knew almost everything there was to know about U-boat 653." Chapter 6, part 1, p. 279

"The Enigma came on with a...