| Part I | How We Got to the Age of Danger | |
| 1 | Introduction | 3 |
| 2 | The Warning Machine and the Action Machine | 14 |
| Part II | Great Power Rivalries and the New Superpowers | |
| 3 | China | 87 |
| Time Is on Our Side (Until It isn't) | |
| 4 | Russia | 152 |
| The Danger Hiding in Plain Sight | |
| Part III | New Weapons and New Threats | |
| 5 | Germs | 193 |
| Saving Lives, Avoiding Extinction | |
| 6 | Digits | 228 |
| Defending at the Speed of Light | |
| 7 | Drones | 265 |
| An American Monopoly Lost | |
| 8 | Storms | 295 |
| Everything, Everywhere, All at Once | |
| Part IV | What is to be a Done? | |
| 9 | Retooling the Machine for the Age of Danger | 319 |
| Acknowledgments | 349 |
| Index | 353 |