They are an elite force of brave men and women who put their lives on the line. Their mission: to guard the most powerful person in the world. But just who are these American heroes? And what secrets are they protecting? This episode goes inside one of the most top-secret law enforcement agencies in the United States. But is there more to the Secret Service than just protecting America's greatest asset? And do recent scandals signify a growing problem within the ranks? Current director of the U.S. Secret Service, Julia Pierson, discusses the history of the agency and the growing threats against the office of the President. Former U.S. Secret Service special agent, Dan Bongino, reveals the grueling agency selection process and the psychology involved in assessing ever-present dangers. And Political Journalist, Marc Ambinder, examines the scandal in Cartagena, Columbia and how it has impacted the culture within the Secret Service.