A third can be found by going right and upstairs inside the cathedral. One is specifically noted to be in the tunnel within Sister Judy's bedroom Wilkes Mansion
The system is built on a loop of exploration and backtracking. As you progress through the main story, new areas of the Northwood community open up. However, you will often find that you cannot reach certain glowing items or chests because you lack a specific tool—like a shovel, a magnet, or a pickaxe. the genesis order old books work