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
Shaken, not stirred for the first time, Bond orders a drink from a barman while at the casino. The drink will later be referred to as a "Vesper", after the original Bond girl, Vesper Lynd. A Vesper differs from Bond's usual cocktail of choice, the martini, in that it uses both gin and vodka, Kina Lillet instead of vermouth, and lemon peel instead of an olive. In the same scene Bond gives more details about the Vesper, telling the same barman that vodka made from grain instead of potatoes makes the drink even better. Kina Lillet is no longer available, but can be