Open Channel: A First Contact Hard Science Fiction Thriller. The Arrival Window Trilogy, #2

Earth finally believes Dr. Mara Ellison. That belief is about to cost a fleet. The impossible object detected beyond the edge of the Solar System has become thousands of faint signatures, scattered across a volume too vast for any navy to confront. Earth's answer is simple: send a task force to intercept whatever is coming before it reaches the inner planets. Commander Gideon Renner is given the mission, a patched-together fleet, and a fuel budget that makes the journey almost one-way.
Mara joins the expedition as science lead, carrying a warning no one wants to hear: every new observation suggests they're preparing to fight the wrong kind of enemy. As the task force pushes deeper into the darkness, every assumption begins to fail. The incoming phenomenon refuses to behave like a fleet, a weapon, or anything humanity has ever encountered. Every attempt to define it only reveals a larger mystery-and every decision carries consequences measured not only in lives, but in humanity's future.
You can't win a war against geology. You can only make it take longer. Now Renner must decide whether to sacrifice his ships for a battle he cannot win-or return home carrying a truth that will forever change humanity's place in the universe. Open Channel is Book Two of the Arrival Window Trilogy, an intelligent hard science fiction thriller where the greatest danger isn't what waits in the dark-it's realizing we've misunderstood it from the very beginning.