Ronan unfolds his story with admirable verve and clarity... [His] exposition includes entertaining glimpses of the personalities involved in this extraordinary quest, but best of all gives an admirabe amount of detail concerning the actual substance of their work. Peter Pesic. TLS ...accessible, artfully written...it stresses the human side of the drama. Though I have been a long-time participant in the story, I found myself learning much in every chapter and not wanting to put the book down. Robert L. Griess Jr. Ronan does a good job of describing the mathematics in broad strokes and giving a flavour of what is happening and - more importantly - why mathematicians get excited about these questions. The Mathematical Association of America This book tells for the first time the fascinating story of the biggest theorem ever to have been proved. Mark Ronan graphically describes not only the last few decades of the chase and the intriguing characters who led it, but also some of the more interesting byways, including my personal favourite, the one I called "Monstrous Moonshine". John H. Conway, F.R.S. Ronan tells a good story, and in doing so he paints a convincing picture of how mathematicians conduct their research. Gareth Jones, London Mathematical Society Newsletter

Prologue; 1. Theaetetus's Icosahedron; 2. Galois: Death of a Genius; 3. Irrational Solutions; 4. Groups; 5. Sophus Lie; 6. Lie Groups and Physics; 7. Going Finite; 8. After the War; 9. The Man from Uccle; 10. The Big Theorum; 11. Pandora's Box; 12. The Leech Lattice; 13. Fischer's Monsters; 14. The Atlas; 15. A Monstrous Mystery; 16. Construction; 17. Moonshine; Appendix 1: The Golden Section; Appendix 2: The Witt Design; Appendix 3: The Leech Lattice; Appendix4: The 26 Exceptions