Mitochondria are tiny structures within all our cells, believed to have once evolved from bacteria living independent lives. Drawing on cutting edge research, this book explores the fundamental role they play in some of the biggest themes in biology: evolution, the origin of the sexes, in growth, ageing, disease, and in death. I defy anyone to read this book and not come out amazed by the incredible subtlety, complexity, and downright unlikeliness of the mechanisms of biological construction. This book opens up the secrets with an obvious delight from Lane that the readers are likely to share.