One of my favorite C words is Chicanery. If you're unfamiliar with this word, it means:
deception by artful subterfuge
It's one of those interesting words that sounds like what it is (at least in my mind anyway). It also reminds me of another C word, Chancery. Ironically this word deals with courts of public record, archives, or high courts (as in Great Britain). Very ironic, if you ask me. Of course, I tend to be very cynical when it comes to lawyers and/or judges.
Chicanery (to get back to today's word) seems to me to be one of those words that would fit very well in a spy novel. Maybe one of James Bond's villains could use it during their final evil speech, just before they leave poor ol' James tied up on a conveyor belt headed for a deadly laser. In any event, it's a cool word that's not used often enough.
Any other cool C words you know?