The Other Earth

When astronomer Dr. Lena Okafor discovers a planet twelve light-years away
whose continents, oceans, and cities mirror Earth, the scientific world is
stunned. The impossible becomes terrifyingly real when a transmission arrives
from the planet — and it knows her name.

Soon physicist Daniel Mercer, haunted by his role in the classified Janus
experiment, receives a second warning: he must never come to that world. But
as governments tighten their grip and the mystery deepens, Lena and Daniel
are drawn into a race across science, secrecy, and space itself.

On the Other Earth they find a civilization both familiar and unsettlingly
different — a world shaped by other choices, other losses, and one revelation
powerful enough to threaten both planets.

Part first-contact mystery, part high-stakes adventure, The Other Earth is a
sweeping novel of suspense, discovery, and the question at the heart of every
civilization: if another humanity exists, what do we owe each other?