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
Vesper Lynd union. She poses as a radio seller, working with Rene Mathis, and later as Bond's companion to infiltrate the casino in Royale-les-Eaux, in which Le Chiffre frequently gambles. After Bond takes all of Le Chiffre's money in a high-stakes game of baccarat, Vesper is abducted by Le Chiffre's thugs, who also nab Bond when he tries to rescue her. Both are rescued after Le Chiffre is murdered by a SMERSH agent, but only after Bond has been tortured. Vesper visits Bond every day in the hospital, and the two grow very close; much to his own surprise, Bond develops genuine