When art dealer Julian Isherwood is held by the Italian police as a suspect in a brutal murder, legendary spy and art restorer Gabriel Allon takes on one simple task to save his friend: find the most famous missing painting in the world. Gabriel embarks on a daring gambit to recover the iconic Caravaggio masterpiece that will take him on an exhilarating hunt - from Marseilles and Corsica, to Paris and Geneva, and, finally, to a small private bank in Austria, where a dangerous man stands guard over the ill-gotten wealth of one of the world's most brutal dictators ... - Publishers description.