On Her Majesty's Secret Service is the tenth novel in Ian Fleming's James Bond series, first published in 1963. Fleming wrote the book in Jamaica while the first film in the Eon Productions series of films, Dr. No, was being filmed nearby.
On Her Majesty's Secret Service is the second book in what is known as the "Blofeld trilogy," which begins with Thunderball and concludes with You Only Live Twice. The story centres on Bond's ongoing search to find Ernst Stavro Blofeld after the Thunderball incident; through contact with the College of Arms in London Bond finds Blofeld based in Switzerland. After meeting him and discovering his latest plans, Bond attacks the centre where he is based.