Catherine Belton’s book, Putin’s People, is the kind of work that comes around once in a generation and defines it. Just as David Hoffman’s The Oligarchs was the definitive account of the ruling class of the Boris Yeltsin era, Putin’s People is the best record of the Putin era. Starting in 1980s Dresden and taking the reader through to the present day, Belton shows exactly how Vladimir Putin used his position and connections in the K.G.B., and later the F.S.B., to build a shadowy financial empire, one that he has used to fund Moscow’s efforts to undermine the West. In Washington, the book made a big splash since it was published a year ago. It has been read and discussed everywhere from Capitol Hill and the White House to C.I.A. headquarters at Langley. Which bodes well for the U.S. government’s view of Russia: if they’re imbibing Belton’s meticulous and original reporting, as well as her accurate portrayal of how Putin’s Russia runs, then there’s a good chance they won’t be as misguided as in years past.