What is the theme in The Unlikely Spy by Daniel Silva?

Another theme that you might consider is heroism. In The Unlikely Spy, there are many heroes, some quite obvious, some less so. A hero is someone who risks harm to themselves in order to save others. During war, risks and danger are ever present, and the opportunity to become a hero is more available than during peace. However, the choice to step up and take action requires the same amount of courage, whether the action is to jump into water to save a drowning person or choose a career that means constant danger of exposure while obtaining secrets that will save your country.