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
Bond girl in the 1950s. Vesper Lynd, Gala Brand, Tatiana Romanova, Mary Ann Russell, and Mary Goodnight are in intelligence or law-enforcement work. Those who are criminals, such as Tiffany Case and Pussy Galore, tend to be similarly independent-minded in how they approach their work—the latter even running her own syndicate. Even those Bond girls who have more conventional or glamorous jobs show themselves to be invested in having an independent outlook on life. While the Bond girls are clearly intended as sex objects, they are nevertheless portrayed in the novels as having a high degree of independence; this is also frequently