Okay, nothing obviously out of line with the century-old 14-volume history of Absalom that was left in his bedroom in the 'Imperial Palace' where the Conspiracy brought him immediately after faking the 'Zon-Kuthon godwar', the point at which the Conspiracy started to take its game against him seriously. That probably wasn't enough time for them to fake entire books, which is why they gave him a century-old set of 14 books, which is the sort of thing that Conspiracy Asmodia would not have permitted if she'd then been in charge, she would have had his room devoid of books rather than do that. There's a lot of reasons they might be trying to hide something that happened in the last century, but whatever it is, it's even more likely to be in Absalom than elsewhere, and Keltham has any idea of what Absalom was like a century ago.
He can't exactly sight-read the city skyline - for all he knows, anything really tall could be the Starstone Cathedral - but the wide variety of weird tall buildings at least looks like 'Absalom' should look.
Does Keltham see anything that looks like a bookshop?