After the poisoning of a Russian billionaire, Gabriel Allon travels across Europe and finds himself in the reach of a virtuoso cellist who may be able to help uncover the truth about his friend's death. The fatal poisoning of a Russian billionaire sends Gabriel Allon on a dangerous journey across Europe and into the orbit of a musical virtuoso who may hold the key to the truth about his friend's death. The plot Allon uncovers leads to secret channels...