But there may have been a novel he did have in his head instead, or at least a film based on one. Consider Dan Brown's work vs. Children of Men:
- Both have protagonists who are contacted by associates who pull them into a conspiracy only to die.
- Both protagonists are left in charge of the protection/safely of a young woman.
- Both protagonists must flee with said young woman when those she should be able to trust (the cops or the fish respectively) turn out to have their own agendas.
- Both flee to the protection of an older colleague/mentor who lives in an estate in the country (and happens to be played by a famous British actor).
- Both must get the young woman out of the UK and into the waiting arms of a secret and mysterious organization.
- Both young women are special.
Just something fun to think about. Of course, there is one more point of commonality - both are also better films than books!