Over recent decades, numerous incidents at the Pathfinder Society's Grand Lodge in Absalom have damaged the priceless collections, destroying many documents outright. The Society has sent the PCs to Nexus House in the arcane metropolis of Quantium, hoping that the second oldest Pathfinder lodge might contain duplicates of the lost texts to copy and study. Yet the PCs are not the only ones interested in the secrets preserved in Nexus House, and the PCs find themselves on the trail of unlikely criminals.