Deborah McDonald and Jeremy Dronfield have written a readable account of the “life, loves and lies” of “Russia’s most seductive spy.” Born into an aristocratic family in 1892 and cared for by an Irish nanny, young Moura “grew up speaking better English than Russian.” The story swoops past pre-dawn Sparrow Hills in Moscow, a rural estate in Estonia or early Soviet Petrograd (today’s St. Petersburg) to Capri, where Budberg briefly lived with Maxim Gorky, or interwar Essex, where she later visited H.G. Wells. Both writers were her lovers...