Gabriel Allon's nightmares come back to haunt him in this tense thriller from #1 New York Times bestselling author Daniel Silva. Art restorer and sometime spy Gabriel Allon is sent to Vienna to discover the truth behind a bombing that killed 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...