Signal Discipline: A First Contact Hard Science Fiction Thriller. The Arrival Window Trilogy, #1

For eleven years, Dr. Mara Ellison has trusted one principle above all others:The data never lies. Stationed aboard humanity's most sensitive deep-space observatory, Mara spends her nights listening for the faint distortions that massive objects leave in the fabric of space itself. When the array detects an impossible gravitational signature more than one hundred astronomical units from the Sun, she assumes it's a flaw in the instruments.
She is wrong. The object is enormous. It isn't following any natural orbit. And it is slowing down. As Mara and her colleagues exhaust every scientific explanation, they uncover evidence that defies everything humanity believes about the universe. Something unimaginably massive is approaching the Solar System under its own control-and the moment they prove it exists, it abruptly changes its behavior, as though it knows it has been discovered.
Far from the politics of the inner planets, Commander Elias Renner is ordered to escort a civilian survey team to the isolated research station. The classified mission arrives through secret channels, bypassing the normal chain of command, and the orders raise more questions than they answer. Why send a warship to protect a scientific outpost? What has Fleet Command already learned? And why does every attempt to uncover the truth encounter carefully managed silence?As scientists, soldiers, and political leaders race to understand a phenomenon unlike anything humanity has ever encountered, one unsettling possibility begins to emerge:Perhaps they are no longer observing the unknown.
Perhaps the unknown is observing them. Blending rigorous science with escalating suspense, Signal Discipline is an intelligent, thought-provoking science fiction thriller about discovery, secrecy, and first contact unlike anything humanity expected. Perfect for readers who enjoy realistic space exploration, hard science fiction, and mysteries where every answer reveals an even greater question. The signal has been detected.
Now something is listening back.