I The Measure of a Life.- Tracking Him Down: A Torrent of Stories.- II Family Background and Upbringing.- The Family Tree.- The Priestly Family at Nordfjordeid.- Father's Home in Moss.- III School and Education.- Nissen's School. Examen Artium.- Student Life.- The Lack of a Calling.- IV In Tune with the Times.- Into Mathematical History.- There was a Mathematician in Him.- The First Tour Abroad.- Parliamentary Professor.- V Professor in Christiania.- "My Inner Life Has Been Most Mighty".- "My Life's Good Fortune".- Marriage at Last.- Herr Professor mit seiner Gemahlin.- In the Lee of "the Modern Breakthrough".- A Steady Stream of Works.- The Mathematical Milieu at Home and Abroad.- "It is Lonely, Terribly Lonely".- Summoned to Leipzig.- VI Professor in Leipzig.- The Coming Period: A More Difficult Balancing Act.- In the Big City of Leipzig.- Breakdown.- Fame.- Conflicts.- Norwegian Students.- Back to Norway.- VII At the End of the Road.- The Final Years.- Appendices.- Chronology.- Notes and Commentaries.- Sophus Lie's Descendants.- Chronological Bibliography of Sophus Lie's Published Works.- Acknowledgements.- List of Literature.- Index of Names.