When Jean and Claire return from the Seed, they expect the world to have changed. Instead, the ocean and sky look the same-until the Lattice begins to sing. A planetary network buried in rock and sea has awakened, calling out coordinates that could heal the planet-or hand its power to the highest bidder.Pursued by rival states, a ruthless consortium, and mercenaries who turn repair into ransom, the former engineer and the security specialist must do the impossible: prove that stewardship matters more than ownership. With Isabel's hard-earned misdirections, Thorne's hungry science, and Penhaligon's legal theater, they stitch together a fragile plan-witnessed hands, hardened logs, and a new law born in light: the Vesper Protocol.Fast, human, and quietly terrifying, Echoes of the Lattice asks how much of yourself you will give to save the world, and whether two people's promise can hold a planet against those who would make it a ledger. The Seed has asked for stewards. The world wants something else. Which will win?