Earth's first off-world colony on Zhinu, twenty-five light years away and established more than a century earlier in 2235 AD, has mysteriously gone silent. Probes have identified small remnant communities, but the capital with its thousands of colonists has become a ghost town. Macpherson Yenko, famed yet controversial quantum physicist, joins the hazardous rescue mission to the remote colony . . . and finds himself uncovering the deadly truth that threatens the extinction of humanity itself.