Introduction: Robert Chesney, James Shires, Max Smeets; Setting the Stage: Rethinking (In)stability In And Of Cyberspace; Part I: Escalation; 1. Jason Healey and Robert Jervis, The Escalation Inversion and Other Oddities of Situational Cyber Stability; 2. Ben Buchanan and Fiona Cunningham, Preparing the Cyber Battlefield: Assessing a Novel Escalation Risk in a Sino-American Crisis; 3. Jaclyn A. Kerr, 'Concept Misalignment and Cyberspace Instability: Lessons from Cyber-Enabled Disinformation; Part II: Institutions; 4. Joe Burton and Tim Stevens; System, Alliance, Domain: A Three-Frame Analysis of NATO’s Contribution to Cyber Stability; 5. Emily O. Goldman, From Reaction to Action: Adopting a Competitive Posture in Cyber Diplomacy; 6. Rebecca Slayton, (De)Stabilizing Cyber Warriors: The Emergence of Military Cyber Expertise, 1967-2018; Part III: Infrastructures; 7. Mark A. Raymond, Cyber Entanglement and the Stability of the Contemporary Rules-Based Global Order; 8. Siena Anstis, Sophie Barnett, Sharly Chan, Niamh Leonard, and Ron Deibert, The Negative Externalities of Cyberspace Instability for Global Civil Society; Part IV: Subaltern and Decolonial Perspectives; 9. Mailyn Fidler, Infrastructure, Law, and Cyber Instability: An African Case Study; 10. Densua Mumford, Confronting Coloniality in Cyberspace Debates: Making the Concept of (In)Stability Useful; Notes on Contributors.