Built around the extraordinary penetrative power, cross-temporal transmission, and low interaction rate of neutrinos, or "ghost particles," this sci-fi story imagines that neutrinos can carry information on a cosmic scale and pass through barriers in space and time. Using a new generation of neutrino detectors, humanity captures a signal from the civilization of the Vega system, 2,000 light-years away. The signal turns out to be a warning about the collapse of spacetime in the Milky Way, with humanity's future hidden within it.
