This book investigates the fundamental ontological and epistemological challenges posed by quantum mechanics, specifically focusing on the implications of nonlocality and the completeness of the theory. Michael Redhead, a noted philosopher of physics, utilizes a rigorous analytical framework to examine whether quantum mechanics provides a comprehensive description of physical reality or if it remains an incomplete representation of the microphysical world. By dissecting the tension between local realism and the experimental evidence of quantum entanglement, the author establishes a foundation for understanding the conceptual shifts required by modern physics.

Experts in the philosophy of science frequently cite this work as a foundational text for understanding the conceptual difficulties inherent in quantum theory. Readers often note the academic density of the prose, which requires a solid background in both physics and philosophical logic to fully grasp the arguments presented.