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 feelings for her, and even dreams of leaving the service and marrying her. After he is released from the hospital, they go on a holiday together and eventually become lovers. Vesper has a terrible secret, however: She is a double agent working for Russian Ministry of Internal Affairs (MVD) and only worked with Bond because she was ordered to see that he did not escape Le Chiffre. (Her kidnapping was staged to lure Bond into Le Chiffre's clutches.) Before she met Bond, she had been romantically involved with a Polish RAF operative. This man had been captured by SMERSH, and