Art restorer and sometime spy Gabriel Allon is sent to Vienna to discover the truth behind a bombing that gravely injured an old friend, but while there he encounters something that turns his world upside down. It is a face --- a face that feels hauntingly familiar, a face that chills him to the bone.While desperately searching for answers, Allon will uncover a portrait of evil stretching across sixty years and thousands of lives --- and into his own personal nightmares ...