A report by Valentine Vivian, Head of Section V, Secret Intelligence Service (MI6), on the arrest in Shanghai of "Hilaire Noulens" (aka Jakob Rudnik), a suspected Soviet agent. Topics covered in the report include the documents seized after Noulens’ arrest; details of the organisation and funding of his intelligence bureau; descriptions of the expenditure of the bureau; detailed descriptions of the bureau staff, including some of their cover identities; descriptions of their methods of communicating with Moscow; connections to other Asian countries; a description of the links between the Noulens organisation and the Communisty Party of China; a chart summarising the foreign intelligence organisation of the U.S.S.R.; and a description of the consequences within China of the arrest of Noulens, and resulting disclosures.