Introduction
Quantum gravity offers a fertile ground for philosophical work, particularly through its suggestion that spacetime may not be fundamental but merely a derivative structure. As such, theories of quantum gravity stand in a long tradition of physical theories with deep implications for the nature of space and time, and indeed the fundamental structure of our material world. This Introduction summarizes the contributions to this collection by structuring them around three themes. The first group of chapters analyses various aspects of the search of lost spacetime in quantum gravity. The second group studies metaphysical and epistemological aspects of the emergence in play in quantum gravity. The third group widens the investigations to several key methodological challenges arising in the context of quantum gravity.