Motifs in the James Bond film series the degree to which Bond girls are pivotal to propelling the plot forward varies from one film to the next. Five of the Bond girls are "bad" girls (or at least working for the villain) who turn "good" (or switch sides) usually due to Bond's influence. Bond has fallen in love with only Tracy di Vicenzo in "On Her Majesty's Secret Service" and Vesper Lynd in "Casino Royale", but both of them die at or near the end of the respective films. Roald Dahl, a screenwriter of "You Only Live Twice", said he was given a formula to work to
Casino Royale (novel) a 1954 episode of the CBS television series "Climax!" with Barry Nelson as an American Bond, a 1967 film version with David Niven playing "Sir James Bond", and a 2006 film in the Eon Productions film series starring Daniel Craig as James Bond. M, the Head of the British Secret Service, assigns James Bond, 007, to play against and bankrupt Le Chiffre, the paymaster for a SMERSH-controlled trade union, in a high-stakes baccarat game at the Royale-les-Eaux casino in northern France. As part of Bond's cover as a rich Jamaican playboy, M also assigns as his companion Vesper Lynd, personal