The Moonquake Warning

The Moon has begun to shake.

At first, the tremors are almost too small to detect. Then lunar seismic stations record the same signal repeating every ninety-six minutes and thirteen seconds-perfectly timed, steadily growing, and unlike anything nature should be able to produce.

As fractures spread across the lunar surface, Earth's oceans begin behaving impossibly. Harbors rise during low tide. Rivers reverse direction. Coastal cities flood beneath clear skies. Animals flee inland, and people across the world hear the voices of their dead whispering from water.

Dr. Miriam Saye is among the first to recognize the truth.

The Moon is not breaking apart.

It is opening.

Hidden beneath its ancient crust lies an enormous containment structure built around something connected to every ocean, river, cloud, and living body on Earth. As astronauts aboard Selene Nine descend through the lunar fractures, they discover black organic walls, colossal braces holding the Moon closed, and warnings that match symbols carved by civilizations lost beneath prehistoric seas.

The imprisoned intelligence is known as the Undertide.

It has been sleeping for thousands of years.

Now it is calling to humanity through memory, grief, and water-and every person who answers makes it stronger.

With the oceans rising toward the sky and the Moon's shell peeling open, Miriam, ocean physicist Gabriel Dae, disgraced archaeoastronomer Silas Renner, and Commander Rian Holt must reconstruct an ancient suppression sequence before Earth loses its seas forever.

But the Undertide claims it is not escaping to destroy humanity.

It is running from something worse.

And that something is already approaching the solar system.

The Moonquake Warning is a terrifying global-disaster thriller blending lunar science fiction, cosmic horror, ancient mystery, and emotional survival. Perfect for readers who enjoy apocalyptic suspense, mysterious signals, planetary catastrophes, and stories in which humanity discovers that the most familiar object in the night sky may have been a prison all along.