Art Restorer and Spy Gabriel Allon is Sent to Vienna to Discover the Truth Behind a Bombing Which Killed an Old Friend - a Nazi Hunter.;While There He Encounters Something That Turns His Whole Life Upside Down.;Each Fact He Uncovers Only Leads to More Questions Until Finally a Picture Emerges Which is More Terrible Than He Could Have Ever Imagined - a Portrait of Evil Stretching Across 60 Years and Thousands of Lives Into His Own Personal Nightmares.