But I'm not talking about the murderer but the paladin girl. He is searching for her in this chapter.
Hey, translator here.
The World Book only shows the "area" where someone is in their Character Sheet (i.e Charlotte & Yukito would both have "Winterhaven" written there).
The World Book is NOT an omnipotent book that can give out information about anything you ask, it's a fantasy version of a D&D Campaign World Book (Sado's "Playing Handbook" is based off D&D's "Player's Handbook").
It was only able to show a few points of interest when Yukito inquired about Sana's whereabouts, which he has now fully cleared except for the Temple of Evil, because this kind of things are under the World Book's jurisdiction.