Mercury Protocol: A Hard Science Fiction Thriller: Quantum Choirs, Corporate Wars, and the Bridge's Return

The sun is saved. The microbe is dormant. Kira Reyes is home.

But the universe isn't done with her.

Two years after the ECHO Protocol mission, Kira has built a fragile peace on Earth. She's testifying at the UN. She's rebuilding her life. She's pretending she's still human.

But the frost-scale beneath her skin remembers. The Mercury ping is growing louder. And something ancient is awakening beneath the Caloris Basin.

The Singers are calling.

Deep beneath Mercury's scorched surface lies Substruct...