Bloodline Witness

Chapter 1: The Anomaly

The sequencer had been running for six hours when Sarah Chen realized something was wrong.

Not wrong in the way that made you call maintenance or file a trouble ticket. Wrong in the way that made you lean back from your monitor, remove your glasses, and press your palms against your eyes until you saw stars. The kind of wrong that lived in the gap between what you expected and what the data insisted was true.

She was alone in the lab—deliberately. Three in the morning on a Tuesday, the kind of hour when the Portland Medical Research Institute felt less like a workplace and more like a temple to something she couldn't quite name. The strip lighting hummed its constant frequency. Outside the window, the city was a scatter of lights against the Columbia River darkness, the West Hills rising like a sleeping animal.

Sarah pulled her glasses back on and stared at the sequence again.

Her grandmother Margaret's DNA was spread across the screen in four columns of ACTG, the base pairs arranging themselves into the familiar ladder of life. She'd run this analysis a dozen times before—routine ancestry work, the kind of thing that paid the department's overhead while she waited for grant funding to come through on her real project. Margaret was ninety-three, living in a care facility in Bend, and her granddaughter had promised to trace the family tree, to give her some genealogical closure before the Alzheimer's took the last