The Signal. The Aether's Echo, #1

The silence of the cosmos wasn't empty. It was holding its breath. Dr. Elias Thorne spent his life filtering out the noise of the universe, waiting for a whisper. But when the contact finally comes, it isn't a radio broadcast from a distant star. It is a rhythmic, impossible gravitational pulse emanating from the edge of our own solar system-from the frozen dark side of Pluto. The signal is not a greeting; it is a tether.
A gravitational grappling hook has locked onto the solar system, accompanied by a countdown. If the connection isn't stabilized at the source, the backlash will shatter the inner planets. In a desperate bid for survival, Earth's fracturing superpowers unite to build the Orpheus. This massive vessel is powered by the Phantom Drive, a dimension-folding engine reverse-engineered from a mysterious artifact found on Mars.
Elias joins a crew of the world's best-including the iron-willed Commander Wei and the stoic Russian engineer Dimitri Volkov-on a one-way trip into the dark. But as they cross the void, the crew realizes the Phantom Drive is more than just an engine. It connects to their minds, dragging them into shared nightmares of a "Hollow World" and a black sun. The ship is listening, and it is taking them home.
When the Orpheus pierces the crust of Pluto, they discover the terrifying truth: the dwarf planet is a lie. It is an artificial shell, a camouflage hiding a city-sized machine that has been sleeping for four billion years. The signal wasn't a distress call-it was a remote starter. Now, Elias and his crew are trapped in the throat of a waking god that views them not as explorers, but as a viral infection.
As the ancient station prepares to shed its icy shell and depart the solar system to rejoin a galactic fleet, the crew of the Orpheus must choose: return to an Earth that will never believe them, or follow the machine into the unknown to find the architects of the universe.