The Janus man - Colin Forbes (Tweed & Co #4)

'The wires hum across North Germany. The same message repeated again and again. Tweed is coming... Tweed is coming...'

A British agent found floating in the Binnenalster at Hamburg. A murder clumsily disguised as an accident to lure Tweed of the SIS into a killing ground in the borderland of the Cold War...

With Bob Newman, foreign correspondent turned minder, to watch his back, Tweed hunts a killer working on Moscow orders from Hamburg and Lübeck to Copenhagen and Oslo and back to the East Anglia countryside.

And he knows that there's an enemy in his own citadel, that one of his four European section chiefs is working for the other side. Codename Balkan, the Janus man who faces both East and West.

As the body count rises, the command goes out from the East: Kill Tweed...