International investigators are the anti-corruption sleuths who work in many international institutions. Their job is to investigate corrupt practices within and around the projects funded by their institutions that are being implemented in different parts of the world. They have to be hard, tough and clever. Because of that they may frighten the people who know about what they do and might come under their gaze. But can they be successful as lone rangers? Do they need friendly, collaborative publics? It is easy to think that they don't; but it turns out that if they really want to be effective there are publics that they need to have with them one way or another.