I had one character who could do Ricardo's locations 2-3-4-5 but the book in the first ruins was not visible. He was using a fresh lantern, and it showed light gray when lit. Usually the book becomes visible if you move around a bit. I tried that in several ways around the ruins, still could not see the first book. I went to a provisioner and bought oil to refuel the lantern. It still showed light gray when lit. But now I was able to see the ruins book and finish the first spot. Somewhere in there was also a logout and login, maybe that was the fix instead of buying the lantern oil.