The Russians have uncovered a British spy inside the KGB. The price they demand for the mole’s safe return is simple.

The death of David Callan.

Callan is British Intelligence’s greatest asset. But Russia’s nemesis. And Callan’s boss is prepared to throw him to the wolves.

Callan finds his assets frozen, his contacts spooked and an enemy who knows his every move.

He has no chance.

Isolated and betrayed, Callan is hunted across London by three KGB killers.

Callan is the best for a reason, and soon the KGB find that in this deadly game of cat and mouse their enemy has no intention of going quietly . . .

Fans of Frederick Forsyth, Mark Dawson, Mick Herron, John le Carré and Len Deighton will be gripped by this classic thriller series full of shocking twists.

MEET DAVID CALLAN

Sardonic, complex and ferociously downbeat, David Callan is a working class former soldier recruited into the dark and elusive world of British Intelligence. He is their most efficient assassin, and as a result, has many enemies and very few friends. Frighteningly good at what he does, Callan has begun to question his work. But for an assassin of his calibre, leaving is never an option.

Portrayed by actor Edward Woodward in the classic television series (1967-72), David Callan is an iconic figure of crime fiction.