The Serpent Gate (The Starwatcher Chronicles)

Some doors were never meant to be opened.
Others were meant to be watched.

In the aftermath of a discovery that cost a man his life, historian Lucas Higgins is trying to do the one thing knowledge has never allowed him to do: stop.
Stop researching.
Stop looking upward.
Stop asking what ancient civilizations were really mapping in the stars.

But the past doesn't stay buried.

When a surviving artefact begins to behave in ways modern science can't explain, Lucas and archaeologist Susan Lucev are drawn to a place older than written history, Göbekli Tepe, a Neolithic site whose stones predate civilisation itself. Officially, access is restricted. Unofficially, something is already moving beneath the surface.

As data disappears, records quietly correct themselves, and unseen hands begin to manage what humanity is allowed to know, Lucas realises the truth is more dangerous than ignorance. The ancient builders didn't leave monuments to guide the future, they left warnings.

At the heart of it all lies the Serpent Gate:
not a doorway to another world,
but a threshold into knowledge humanity may not be ready to face.

And this time, someone is watching who notices when the gate is crossed.