[Skulduggery doesn't like abandoned factories as a rule. He watched his best friend being turned to stone outside one, so the dislike is admittedly biased, but the idea of an abandoned factory being a meeting place for person or persons unknown is just so bland. In his opinion, if a group of people are planning something diabolical and/or evil, it must be something they care quite a lot about, and hence they could easily come up with a slightly more original conduit for their plans than the cliche of an abandoned factory.

Still, he's not one to ignore potential clues just because they bore him.]

Mundane items? [Hm.] When Malicant abandoned the Palace just before we defeated him, the library turned out to hide a secret entrance to an underground cavern where less-than-savoury deeds were taking place. Ritual sacrifice, experimentation, that sort of thing. The entrance has since been closed off. I'm not sure who did it, but I doubt they were trying to do anyone a public service. With the library laid bare, we might just be making someone somewhere very angry.

[And they then decided to steal a variety of mundane items from the construction ground? Something there doesn't fit.]