Primo Levi, author of Survival in Auschwitz and The Periodic Table , wrote books that have been called the essential works of humankind. Yet he lived an unremarkable existence, remaining until his death in the house in which he'd been born; managing a paint and varnish factory for thirty years; and tending his invalid mother to the last. Now, in a matchless account, Ian Thomson unravels the strands of a life as improbable as it was influential, the...