Ever since Vladimir Putin came to power in Russia, his critics have turned up dead on a regular basis. According to Amy Knight, this is no coincidence. In Orders to Kill, the KGB scholar ties dozens of victims together to expose a campaign of political murder during Putin's reign that even includes terrorist attacks such as the Boston Marathon bombing.

Russia is no stranger to political murder, from the tsars to the Soviets to the Putin regime, during which many journalists, activists and political opponents have been killed. Kremlin defenders like to say, "There is no proof," however convenient these deaths have been for Putin, and, unsurprisingly, because he controls all investigations, Putin is never seen holding a smoking gun.

Orders to Kill is a story long hidden in plain sight with huge ramifications.