Peter Wright in 1963 following what Wright refers to as a tip-off by "a fifth man, still inside", he became convinced that the KGB had penetrated the higher reaches of MI5. As claimed in "Spycatcher", Wright had come to believe that Roger Hollis was the highest traitor in MI5. Wright went so far as to begin to make, as he himself put it, "his own 'freelance' inquiries into Hollis' background" shortly before the latter's retirement. According to Wright, his initial, unspecified, suspicion was aroused by his analysis of how a Soviet 'illegal' Lonsdale's arrest in January 1961 was handled by the KGB
The Wright Brothers (book) McCullough recalled, "I didn't know when (chronologically) I was going to end that book, and who do I run into in France but the Wright brothers." He continued, "I was delighted to find that Wilbur, at every chance, went to the Louvre to look at paintings, and the degree that he was moved by the great Gothic works of France was far beyond that of an ordinary tourist. [...] Much of what has been written about the Wright brothers (in French) has been ignored. That's what pulled me into doing the book." McCullough has had a lifelong interest in aviation.