Rust and Dust
On the final day of humanity's third Mars mission, geologist Noa Bannister makes a discovery buried four billion years deep in the basalt of an ancient Martian crater — a perfect sphere. Unmarked. Impossibly hard. Utterly inexplicable by any known science.
Alone on the surface of a dying planet, Noa begins to uncover the truth about what the sphere actually is — something that answers the only question that has ever truly mattered: where did we come from?
But four billion years of silence is about to become very loud. The Americans want it classified. The Russians didn't come to share. And somewhere in orbit, a clandestine military order — codenamed Yellow Sparrow — has just been issued.