Multiple alien factions have a stake in humanity's development, and livable worlds are hard to come by, but the monstrosity lurking within planet Thuun's depths can only mean one thing: Humanity, as we know it, will forever be changed. Enforcer Silhouette returns to tackle another interplanetary mission by the order of the tenacious Senator Folami. Colonization on Thuun has come to a halt, and its residents have gone silent. Silhouette joins a team of terraformation specialists and ragtag mercenaries in an effort to bring the facility back online. The crew expects to find death and destruction, but what they discover is madness. When one of the scientists goes missing, Silhouette follows the trail to an underground labyrinth that may hold the answer to Thuun's mysteries.