Rogue Trader Janus Draik, Imperial Navigator Espern Locarno, Eldar ranger Amallyn Shadowguide, and Kroot tracker Dahyak Grekh unite to once again enter the Blackstone Fortress. They are optimistic as they enter the Stygian Aperture, after their first expedition into the fortress had proved quite lucrative, both in archeotech and, perhaps even more valuable, information. There is, however, a nagging feeling, to a greater or lesser degree in each of them, that their initial success might have been a fluke, and that their adventures might prove more dangerous than their previous expedition had led them to believe.