Introduction: Admission -- A momentous message -- Duplicity exposed -- A spy called Elli -- Inauspicious start -- Cosmopolitan comrades -- Strange interlude -- Someone for tennis -- Inside MI5 -- The Krivitsky "coincidence" -- Toxic troika -- Traitors to order -- In charge of "Soviet espionage" -- Secrets by the bagful -- Enter Sonia -- Another insidious immigrant -- "Signing on" -- Calling Moscow -- An enlightening book -- In the city -- Flagrant "divergence" -- Two-headed colossus -- Red light from green -- A high-level culprit -- Calamitous clearance -- An enlightening letter -- First atomic spy -- Enormoz -- The strange behaviour of Roger Hollis -- In a new world -- A mystery resolved -- Blind eye to Elli -- The denigration of Igor Gouzenko -- Long shot shot down -- Protective perfidy -- Back in full flood -- Another GRU defector -- The firs fiasco -- Australian assignment -- Betraying the superbomb -- A brilliant break -- Confessions--of a kind -- Misleading the Attorney General -- Misleading the Prime Minister -- Alienating the Americans -- Unhampered escape -- Volume of deception -- Hollis at bay -- Italian fiasco -- Another volume of deception -- Betrayal beyond belief -- Rigorous scrutiny--for some -- Escape at the double -- A more credible scenario? -- A list of nine -- Reluctant riddance -- Suspicious aftermaths -- Pamphlet of deception -- A ruthless defamation -- Master of minimalism -- A warning from Hoover -- Master of minimalism -- Another spy in MI6 -- The Penkovsky problem -- Another enlightening case -- Another naval spy -- The strange escape of an archtraitor -- "The year that the roof fell in" -- Portentous liaison -- The fall of Supermac -- Irish interlude -- A sordid deal -- Playing the royal card -- Still more cover-ups -- Suspect finish -- Kid-glove showdown -- Overdue cull -- A crucial call -- Two turncoats -- Brush with the police -- Missing link? -- Sonia resurgent -- The Sanden saga, part 1 -- The Sanden saga, part 2 -- Censure deferred -- Conclusion -- Acknowledgements -- Appendix: The scroll of anamalies -- Notes on the sources -- Archival sources -- Bibliography -- Index.