The questions of metaphysics are the deepest and most puzzling questions there are. What is time? Am I free in my actions? What makes me the same person I was as a child? What is it for one thing to cause another? Riddles of Existence is the first book ever to make metaphysics genuinely accessible and fun. Its lively, informal style brings the riddles to life and shows how stimulating it can be to think about them. No philosophical background is required to enjoy this book: anyone who has thought about life's most profound questions will find plenty to provoke and entertain them here.