In 1984 Dr Muller caused international controversy with his theory that a killer star, christened Nemesis, is orbiting the sun and causing cataclysmic comet storms to batter the earth every 26 million years. Greeted with disbelief and derision, the Nemesis hypothesis has nonetheless withstood attempts to demolish it and has provided explanations for a variety of phenomena, including the dramatic disappearance 65 million years ago of the earth's dinosaur population. In this book the author examines himself and his motivations as rigorously as the bizarre assumptions of the Nemesis theory.