A file of memoranda and correspondence discussing the future of the Security Service (MI5). Subjects of discussion in this file include the maintenance of secrecy and cover plans for MI5 and the Secret Intelligence Service (MI6); ministerial responsibility for MI5; an example of the work carried out my MI5, an investigation of possible foreign inducement of the desertion of Jewish soldiers in the British army; the overlap between MI5 and MI6; and the need for an enquiry into the future of MI5, discussed in letters by Anthony Eden, amongst others.