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 (1967 film) then hires Vesper Lynd, a retired agent turned millionaire, to recruit baccarat expert Evelyn Tremble, whom he intends to use to beat SMERSH agent Le Chiffre. Having embezzled SMERSH's money, Le Chiffre is desperate for money to cover up his theft before he is executed. Following up a clue from agent Mimi, Bond persuades his estranged daughter Mata Bond to travel to West Berlin to infiltrate International Mothers' Help, an au pair service that is a cover for a SMERSH training center. Mata uncovers a plan to sell compromising photographs of military leaders from the US, USSR, China and Great