1 ‘for his deficiencies’: KV 3/220/31a.
2 ‘there is strong evidence’: Ellen Radley, email to author, 17 December, 2015.
3 ‘spy who goes alone’: C. W. Sykes, Secrets of Modern Spying (London: John Hamilton 1930), 9.
4 ‘a very reliable informant’: KV 3/59/241a.
5 ‘I was immediately attracted’: Masters, Man Who Was M, 78.
6 ‘the charm this smiling man’: Miller, One Girl’s War, 16, 44.
7 ‘Be confident and unafraid’: Knight, Pets: Usual and Unusual, 34.
8 ‘for your confidence’: Ibid., 29–30.
9 ‘shattered’: Masters, Man Who Was M, 79.
10 ‘thinks differently’: A. P. Herbert, Dolphin Square (London: Haxwell, Watson & Viney, 1935), 4.
11 ‘I have myself felt’: Maxwell Knight, Animals and Ourselves (London: Hodder and Stoughton, 1962), 16.
12 ‘Failure to do this’: Knight, Taming and Handling Animals, 92.
13 ‘It was extremely’: Harry Smith, interview with author, London, January 2016.
14 ‘Joyce, to my mind’: KV 2/245/24a.
15 ‘from an informant’: KV 2/2145/25a.
16 ‘Joyce has a well organised’: Knight to Roberts, 24 January, 1935, Eric Roberts Collection.
17 ‘seriously handicapped’: John Curry, The Security Service 1908–1945 (Kew: Public Record Office, 1999), 393.
18 ‘was growing morose’: KV 2/245/60a.
19 ‘I should not think’: KV 2/245/1b.