The Tourist, written by Olen Steinhauer, is a gripping espionage novel that delves into the world of international surveillance and intelligence agencies. The story follows Milo Weaver, a former CIA agent, as he investigates a series of mysterious deaths linked to his past. As Milo delves deeper into the conspiracy, he uncovers the extent of surveillance and manipulation by powerful entities. This thrilling book combines elements of espionage, suspense, and the dangers of a surveillance state.