The German chancellor has enemies, and one of them has hired "The Scorpion" for twenty million Euros to kill her. The Scorpion is ruthless and relentless. But he hasn't met Captain Sophie Decker yet who is assigned to stop and kill the Scorpion before he can kill the Chancellor.
Robert Ludlum's Bourne books;
Frederick Forsyth's Day of the Jackal;
Mark Dawson's John Milton books.