He then wrote a memoir, published in 1975 as "Vassall: the autobiography of a spy". He described it as "a kind of self-justification, not as regards my espionage activities, but as regards my position as a human being, and, perhaps, my ability to make and keep friends in all walks of life". Rex Winsbury called the book "cross between Jennifer's Diary [the society column of "Queen" magazine and James Bond, ... bewildering both for Vassall's own transparent naivety and social snobbism, ... and for the equally transparent naivety of the British Foreign Office and security forces". Hungarian émigré George Mikes similarly concluded that it was Vassall's "vanity, his childish snobbery, his devouring ambition and complete lack of humour that pushed him so deep into the quagmire".