On August 21, 1976, the crew of the 'Luminous 5' mission landed at the moon's north pole on a scientific expedition to explore a region never before studied.

At first, everything goes according to plan: collecting samples, taking measurements, and recording observations. But suddenly, their instruments pick up a faint signal with no clear explanation.

It's not a technical malfunction, nor any known lunar phenomenon. Driven by curiosity, the crew follows the signal—and soon uncovers a massive discovery buried beneath the moon's surface.

They find a gigantic crashed spacecraft, unlike anything from any human space program. Its silent hull has rested there for thousands of years, a witness to an unknown presence.

Inside, they discover evidence that the ship was never truly abandoned by its crew.

From that moment on, their mission shifts from scientific exploration to confronting a mystery that reached the moon long before them—and may never have left.

You can get the full digital edition of this novel here This story falls under the science fiction genre, titled Unknown Moon.