A tough as nails crew of space marines, experts in battling heretic cults and interdicting hostile vessels, are sent on a mission to recover an ancient derelict starship, the Tesseract, that has appeared in the Carcosa sector at the remote edge of the system. What they've found on board could spell not just their own doom, but the end of humanity. Trapped on the Tesseract by a combination of savage ambush and conspiratorial sabotage, medic Hestia Kratos and veteran sergeant Rynn Cobb must lead their squad of injured marines to safety. But, aboard the derelict, every shadow is a possible threat, and around every corner lurks another hazard. As their life support and ammunition supply dwindles, they must explore the ancient wreck in search of escape as they endure a perpetual running battle against cultists, monsters, and mysterious hallucinations in this relentless scifi horror page turner.