I am in the middle of reading \”Queen of Wands\”….  And I just ran into a small easter egg / Cameo / Cross-over…
There\’s a character, named Artie… Which is asking Barb to place an \”Artifact\” into  a bag.  Who happens to be a Secret Service agent, that handle \”static items. Artifacts. Power Symbols\”.
Which of course, as soon as the artifact goes into the bag:

There was a brief flash of purple light and the feeling of malevolence dropped to nearly nothing.

Yes, it seems that John Ringo has put a Warehouse 13 cameo into his latest book…