The narrative dives deep into the complexities of a polyamorous relationship pushed to its limits. Amara, Vinh, and Jesse, each harboring past hurts and insecurities, find their bonds tested not only by the harsh realities of colonizing a dangerous planet but also by the insidious creep of jealousy. Their individual struggles with trust and possessiveness threaten to fracture their fragile bond, leaving them vulnerable to the planet's dangers and their own inner demons.

The characters in "This World Is Not Yours" are thrust into a desperate battle for survival against both human and extraterrestrial threats. The Gray, a terrifying manifestation of the planet's defense mechanisms, becomes a constant source of terror, forcing the colonists to confront their own mortality and the potential for annihilation. This theme explores the resilience of the human spirit and the lengths people will go to protect themselves and those they love, even in the face of overwhelming danger.

New Belaforme, the planet at the heart of the story, embodies a seductive duality—a captivatingly beautiful landscape teeming with lethal secrets. This juxtaposition highlights the theme of deceptive appearances, reflecting the characters' own struggles with trust and hidden motives. Just as the planet's beauty masks a deadly truth, so too do the characters grapple with hidden resentments and betrayals that fester beneath the surface of their relationships.