Secrets and conspiracies have always played an important role in human history, and today conspiracy theories have become a rather disconcerting practice for picturing our world and our relations with each other. How seriously are we to take them, then? Are we to completely discard them as political rhetoric, purposeful misinformation, or even individual delusions? Or should we take them as serious, perhaps even scientific theories? This collection purports to provide a sober analysis of the much-debated issues and tries to develop and outline conceptual and theoretical tools to make sense of what secrets and conspiracies truly are.