Do Not Open: Book One of the Lines We Don't Cross series (Paperback or Softback)

Aisha Kade is a quantum materials scientist trained to distrust wonder. So when her grandmother’s platinum ring begins returning impossible signals from inside its atomic lattice, she does what any serious scientist would do: she tests, records, verifies, and refuses to jump to conclusions.
Then the ring answers.
Inside the metal is Isorion, a hidden world with cities, laws, and people who know they are being observed. Their council agrees to speak, but only under strict conditions: no spectacle, no force, no crossing boundaries without consent. As Aisha and her small team build the first lawful framework for contact, they must balance science, ethics, quarantine, politics, secrecy, and the growing danger of being overheard by the wrong people.
But this is only the beginning. Across later experiments and new locations, the contact deepens. A name emerges. New corridors appear. And a warning arrives that changes everything:
DO NOT OPEN.
Do Not Open is an intelligent first-contact science fiction thriller about restraint, trust, and the cost of making the impossible ordinary.

Robert G. Pranic is a Melbourne-based Australian author whose fiction spans crime, thriller, science fiction, fantasy, and historical drama. After more than four decades in Information Technology, including senior architecture and problem-solving roles, he turned fully toward the craft that had driven him for years: writing emotionally immersive, commercially compelling fiction. His work combines high-concept ideas, strong narrative momentum, and character-driven tension, with a focus on stories that entertain while pulling readers deeply into their worlds.