Bah I never really bother with books to games anyway unless its for the Prince Of Persia games where you have to put in some sort of code from the manual in order to jump to a certain level.
Quite frankly, the story that starts most games sort of sucks, take the plot of Doom for example: You're a marine who assaulted an officer who ordered his units to fire upon civilians, now you're at a mars base, something goes completely wrong and you rush to the situation, fall asleep and wake up with nothing but your fists and decently loaded pistol and realize that you're the last hope.