"No more passionate voice ever sounded in Russian poetry of the 20th century," Joseph Brodsky writes of Marina Tsvetaeva. And yet Western readers are only now starting to discover what Tsvetaeva's Russian audience has already recognized, "that she was one of the major poetic voices of the century" (Tomas Venclova, The New Republic ). Born to a family of Russian intelligentsia in 1892 and coming of age in the crucible of revolution and war, Tsvetaeva...