chunk: They head to Paris to find clues about Bourne's past. Once in Paris, Bourne learns that his attackers' leader may be "Carlos," who is described as the most dangerous terrorist of his time, responsible for numerous killings in many countries and well connected in the highest government circles. For reasons only partly comprehensible to himself, Bourne develops a compulsion to hunt Carlos. As the story develops, Bourne follows clues that bring him closer to Carlos, leading him to places such as a designer clothing store used as relay for Carlos. Though Bourne twice briefly sees Carlos, he does not manage to catch or kill him. To his distress, Bourne also finds mounting evidence that he himself is a rival assassin called ″Cain.″ Meanwhile, he and St. Jacques are falling in love.