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
Quantum of Solace about as Forster wanted to show oil had replaced gold as the most precious material. The producers rejected Haggis's idea that Vesper Lynd had a child, because "Bond was an orphan … Once he finds the kid, Bond can't just leave the kid." The water supply issue in Bolivia was the main theme of the film, with a story based on the Cochabamba Water Revolt. Michael G. Wilson decided on the film's title "Quantum of Solace" only "a few days" before its announcement on 24 January 2008. It was the name of a short story in Ian Fleming's anthology "For