The book provides a comprehensive view of the ethical challenges around AI and explores real-world examples of how AI can be employed, including intelligence analysis, cyber warfare, and autonomous weapon systems. Centering her argument around the autonomy and learning capabilities of AI technologies, Taddeo creates a coherent ethical framework based in AI ethics and Just War theory to answer the question how can AI in defence be used for good and support policy-makers and practitioners to make informed choices when developing an ethical governance of AI in defence.