By Will McIlroy
Published: July 21, 2011.
An MI-5 officer and master German spy hunt each other in a tale of espionage and betrayal set during the start of World War II.
The pursuit pits strength and resolve against acumen and guile and weaves science, theater and early BBC television around real events.
Both men are predator and prey but one seeks redemption, the other retribution. Neither knows or expects quarter.