Looking at the Temple Map, it looks like you could simply walk right into the Holocron room. There's A LOT of ways to get there, and many of them don't appear to be blocked by any means. Yet a Dark Jedi can't seem to find it?
I appear to be missing how that room is hidden...
Also, for those that have run the beginner adventure, what did you do to 'hide' the hidden parts of the temple map from the players? Simply cover them somehow, or not show players the temple map at all? I like the artistic maps, like how they will help with immersion into the setting and game; but not showing the map defeats that purpose, and covering up huge parts of it simply tells the players "cool stuff this way..."