The Secret Service’s most ruthless assassin, David Callan isn’t given a choice about his target. Just a name and a deadline.

Until he breaks the number one rule.

Never ask why.

Ousted by ‘The Section’ he now works as a low-paid bookkeeper.

Until he is given one last chance — kill German businessman Rudolph Schneider or be out in the cold for good.

With no other option, Callan returns to the murky world of national security. But then he realizes something that changes the rules.

He knows his target.

Now time is running out. Schneider must die or Callan will become a target himself . . .

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.