Hugh Trevor-Roper visited China for three weeks in 1965 under the auspices of the Society for Anglo-Chinese Understanding. Subsequently he was the leading protagonist in a publicly-fought battle over the clandestine finances, communist affiliations, ideological propaganda and organisational mismanagement of SACU, which he indicted as a front for Maoist agents of influence. Two years later he visited Taiwan, Thailand and Cambodia. His detailed diaries offer insight into the secret policing, oppression and fears inside Mao's China in 1965, as well as exploring Trevor-Roper's relationship with the British security services.