On Her Majesty's Secret Service is the tenth novel and eleventh book in Ian Fleming's James Bond series. First published in 1963, it centres on Bond's search to find Ernst Stavro Blofeld after the events depicted in Thunderball (1961). In the novel, Bond falls in love with Tracy di Vicenzo during the story. The pair marry, but hours afterwards Blofeld and his partner, Irma Bunt, attack them and kill Tracy. Fleming developed Bond's character within the book, showing an emotional side that was not previously present. The novel is one of three Bond stories to deal with the disruption of markets and the economy, in this case Blofeld's planned disruption to the food supply by bioterrorism. The novel received broadly positive reviews. In 1969, the book was adapted as the sixth film in Eon Productions' James Bond film series. It was the only film to star George Lazenby as Bond. (This article is part of a featured topic: Ian Fleming's James Bond novels and short stories.)