Earl Conee & Theodore Sider 
Riddles of Existence [PDF ebook] 
A Guided Tour of Metaphysics: New Edition

Riddles of Existence makes metaphysics genuinely accessible, even fun. Its lively, informal style brings the riddles to life and shows how stimulating they can be to think about. No philosophical background is required to enjoy this book. It is ideal for beginning students. Anyone wanting to think about life’s most profound questions will find Riddles of Existence provocative and entertaining. This new edition is updated throughout, and features two extra, specially written chapters: one on metaphysical questions to do with morality, and the other on questions about the nature of metaphysics itself.