Many of the conversations about international cybersecurity have remained siloed in specific disciplines and professional cultures. As such, there is disagreement among academics and practitioners about how to define basic terms, such as “cybersecurity,” and arguments about what should “count” as part of cybersecurity. Because people’s perspectives on cybersecurity are often defined by where they “sit” professionally, practitioners and scholars are sometimes unaware that they do not share a conceptual universe. For instance, many separate international internet governance debates from conversations around global cybersecurity norms, although many of the same cleavages and barriers to agreements occur in both domains. Others consider censorship to be unrelated to cybersecurity, although espionage via hacking uses many of the same tools as the domestic surveillance that goes hand in hand with censorship. Still others do or do not incorporate considerations of internet infrastructure into conversations about conflict in spite of concerns about the security of undersea cables to most global powers. The three books under review—James Shires’s The Politics of Cybersecurity in the Middle East, Florian Egloff’s Semi-State Actors in Cybersecurity, and Kieron O’Hara and Wendy Hall’s Four Internets: Data, Geopolitics, and the Governance of Cyberspace—all help us understand how to think about this landscape. Each untangles some of these disconnects by making assumptions transparent, articulating places of overlap, unpacking terminology and categories, and offering paths forward for scholars.