In London, the British Government has declassified a large number of top secret files regarding British Military Intelligence operations during World War II. One file, concerning espionage operations on Gibraltar, has been smuggled out of the U.K. to Spain. It contains information that will draw Sullivan and Broderick into the dark and treacherous world of wartime Gibraltar—a place where saboteurs and espionage plots abounded, and where double and triple agents from Britain, Germany and Spain were at war in a treacherous and deadly game of undercover operations. It is only a matter of time before past and present collide and a dangerous battle begins to conceal the truth about the Rock's poisonous wartime history. Detectives Sullivan and Broderick become caught in a tangled web of intrigue and murder that will once again test their skills and working relationship to the very limit.

Robert Daws is a British theater and television actor best known for his roles in  series such as Jeeves and Wooster, Midsomer Murders, and most recently, as Dr. Thomas Choake in Poldark.