Barely escaping a doomed transport, the heroes find themselves trapped within a bizarre research facility that has come under attack. Like the other specimens within this crumbling lab, the heroes must seek escape as their first order of business. As they struggle against weird technology and runaway experiments, the heroes run across the elite Stewards agents performing the raid, who prove to be allies and potential rescuers. The Stewards have a mission, however, and they recruit the heroes to help finish it. In so doing, the heroes uncover a little truth and a lot more questions in need of answers!

"Flight of the Sleepers" is a Starfinder Roleplaying Game adventure for four 3rd-level characters. This adventure continues the Threefold Conspiracy Adventure Path, a six-part, monthly campaign in which the heroes unravel the machinations of insidious aliens who have infiltrated galactic society. This book also includes an article describing the enigmatic grays, a survey of fringe science, and a selection of new and strange monsters.