The Forbidden Stone

When a group of friends receives a coded message after a family death, they follow a trail of clues that pulls them into a much bigger mystery. The search begins as a funeral trip and quickly turns into a race to understand a hidden legacy tied to Copernicus.

As the clues lead them across countries, the kids work with a parent figure while a dangerous secret organization follows close behind. They use their knowledge, teamwork, and modern tech to decode messages, solve puzzles, and stay ahead of people who want the relics for themselves.

The story builds toward a larger pattern of hidden objects, ancient secrets, and a world-changing device or legacy. Along the way, the group has to trust one another, survive repeated threats, and keep moving from clue to clue as the larger series mystery opens up.