Through several clicks of cryptography and wordplay, I have determined that "Book of Secrets" is obviously a well-hidden anagram of "Socket of Bores."
Farfetched? Hardly. I'm merely manipulating language and history to further my agenda for entertainment's purposes, bear with me.
Now, according to Google, this mysterious "Bores" refers to one Michael Heath who, upon further research, is revealed to be the one and only Michael T. Heath of the University of Illinois who is the head of the Department of Computer Science.
What? Coincidental? There are several Michael Heaths out there, any of whom can be applicable to this fabricated riddle?... Let's move on.
Given that this legendary "socket" belongs to the aforementioned Heath, it obviously refers to computer sockets, which obviously are what allow two computers to connect and are the fundamental foundation of the Internet.
Huh? This explanation is getting long-winded and boring and keeps dragging on? But that's only because I don't have a sense of pace and speed or excitement and intrigue and keep repeating and restating plot points and story elements over and over and over and over and over again! Jeez, nobody's perfect.
In other words, this blogger wholeheartedly agrees with Turteltaub's assertion that the Internet is truly the most precious national treasure of all. Because, after all, without National Treasure: Internet, how else would I have been able to make sense of all this nonsense?
National Treasure: Book of Secrets: 4/10