Anna Geifman. Entangled in Terror: The Azef Affair and Russian Revolution. Wilmington, DE: SR Books, 2000. x, 247 pp. Bibliography. Index. $60, cloth; $19.95, paper. In May 1908 Vladimir Burtsev, a Russian journalist and sometime socialist with unusual sources of information within tsarist police, accused Evno Azef of being an agent working for both Russian police and Socialist Revolutionary Party (PSR). This charge sent shock waves through Russian revolutionary movement and contributed to temporary collapse of PSR. Azef had been a trusted revolutionary for fifteen years; he was a member of PSR's Central Committee; and for last six years had been a leading figure in their Combat Organization (Boevaia organizatsiia) which in turn had been responsible for a number of sensational political assassinations, most notably that of Interior Minister V.K. von Plehve in 1904 and Grand Duke Sergei Aleksandrovich in 1905. If Azef were a provocateur, then this meant that he had been responsible for arrest of numerous revolutionaries, failure of other plots against regime, revealing of Socialist Revolutionaries' innermost secrets, and discrediting of terror as a political weapon. The party's first response was to defend their longtime colleague. Burtsev was accused of slander and brought before a court of honour. In his defence, he revealed that he obtained confirmation for his suspicions from A.A. Lopukhin, a former Director of Police Department. After verifying this information with Lopukhin, incredulous revolutionaries confronted Azef in Paris in January 1909. Realizing that his denials were unconvincing and fearing for his own safety, he promptly fled to Germany where he lived incognito until his death in 1918. The basic outline of Azef is well known. Burtsev, to enhance his reputation as the Sherlock Holmes of Russian Revolution, published numerous versions of his unmasking of provocateur. The PSR, to salvage something from fiasco, sought to embarrass tsarist government by publicizing terrorist acts Azef allegedly had been involved in at behest of police. The Russian authorities themselves gave credence and publicity to affair by arresting and exiling Lopukhin for assisting revolutionary cause. And Boris Nicolaevsky incorporated much of this evidence and made it accessible to a wider audience in his 1934 biography Azeff Spy: Russian Terrorist and Police Stool. Since then, almost all scholarly accounts of period have followed Burtsev and Nicolaevsky in seeing Azef as classic example of an agent or agent without bothering to explore either his motives or appropriateness of these terms. Anna Geifman, an Associate Professor at Boston University, touched on Azef affair in her Thou Shalt Kill: Revolutionary Terrorism in Russia, 1894-1917 (Princeton, 1993). Now, with aid of material found in State Archives of Russian Federation (GARF), she has provided a much-needed new biography and in doing so has effectively challenged conventional picture of Russia's master spy. To Geifinan Azef was neither a provocateur nor a double agent. …