The Cellist: A Novel (Gabriel Allon, Book 21) by Daniel Silva

In Daniel Silva's "The Cellist," art restorer and spy Gabriel Allon is faced with a complex and dangerous mission. Viktor Orlov, a former Russian oligarch turned anti-Kremlin activist living in London, is assassinated with a nerve agent. All signs point to a Moscow Center assassin who infiltrated Orlov's inner circle. However, Allon, owing his life to Orlov, suspects a deeper conspiracy at play.

As Allon digs deeper, he uncovers a plot orchestrated by a private intelligence service called the Haydn Group, linked to the Russian president's childhood friend. This group is planning a devastating act of violence to destabilize America and strengthen Russia's position on the global stage.

With the help of a young woman from a corrupt bank, Allon races against time to unravel the conspiracy and prevent the impending catastrophe. "The Cellist" is a gripping and timely thriller that delves into the dangers of dirty money and the ongoing threat posed by a resurgent Russia.