The Recovery Window

A pattern in a meteorite fragment that reads like a barcode. Elena Castellanos is running a routine reconfirmation scan on a sample from the Meridian-7 asteroid capsule when she finds banding too regular to be natural, forty-one bands at sub-one-percent spacing variance in a mineral that has no business holding a tolerance like that. She and her colleague Marcus Oyelaran try to break the finding before they trust it, ruling out instrument artifact, sample prep, and pipeline error one by one until nothing ordinary is left to blame. As the anomaly moves up the chain toward senior curation scientist Thomas Renwick, the eight months since the sample's recovery come under a different kind of scrutiny, who saw what, when, and why a signal like this waited so long to surface in a building built to catch exactly this. What began as a confirmation re-scan becomes a test of chain of custody, professional judgment, and the line between unexplained and impossible. The Recovery Window is a scientific mystery about a discovery too precise to dismiss and the institutional reckoning required to trust it. Book 4 of The Unfinished Sky. A complete story that can be read independently.