The hidden man

Mark and Benjamin Keen have not seen their father, Christopher for more than twenty years. He is only just beginning to enlighten them about his life as a master spy when he is murdered in cold blood by an unidentified assassin. Is his death connected to his MI6 past? Had he uncovered a dangerous conspiracy involving his eldest son? And what were Christopher's links to Moscow, Afghanistan and the Russian mafia in London? To discover the truth, and avenge their father's death, the brothers are drawn into the legacy of his life as a spy.