Nitrox 21: Part 4: Race Against Time and the Secret of the Laboratory

by Adam Koss

You want to know what happens next to Donald and his team — this is where the story takes a decisive turn.

The world of Nitrox 21 grows darker. Oxygen remains controlled, cities stay divided, and survival depends on choices no one should ever face. When the truth about the Laboratory begins to surface, Donald and his group realize the system is more complex — and more dangerous — than they believed.

Every step forward brings risk.
Every answer creates new questions.
And the line between protection and control starts to disappear.

This book is Part 4 of the Nitrox 21 saga and continues the story. The next stage of the saga unfolds in the following volume.

5 pages, Kindle Edition

Published October 15, 2025

About the author

🌿 Adam Koss is a Polish author whose work bridges science fiction, adventure, and eco-literature. His stories blend imagination and reflection, exploring the fragile connection between humanity and nature.

📖 His latest children’s eco-fable Capybaras: Guardians of the Jungle follows Kapi — a golden capybara — and a group of children guided by a wise professor as they uncover the Amazon’s secrets and learn what it means to protect the lungs of our planet. 🐾🌳

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✒️ Influenced by Ray Bradbury, Jules Verne, and Antoine de Saint-Exupéry, Adam combines poetic imagination, scientific curiosity, and emotional depth in his storytelling.

🌐 www.adamkoss.pl
| 🐦 @AdamKossAuthor