The Tourist is a gripping espionage thriller by Olen Steinhauer. The story follows Milo Weaver, a former CIA agent who is pulled back into the world of espionage when a colleague goes missing. As Milo investigates, he uncovers a web of secrets, surveillance, and double-crosses. This intricately plotted book keeps readers guessing until the very end, with its twists and turns in the shadowy world of international intelligence agencies.