Elias Thorne, a junior archivist for the Department of Continuity, stared at the string of numbers on his monitor. Most records were straightforward: birth dates, tax filings, retinal scans. But "3792-5460530" was a "Locked Sequence." It had no name attached, no face, and—most disturbingly—no expiration date. In the year 2142, everyone had an expiration date.

In the sterile white halls of the Oakhaven Memory Ward, 3792-5460530 wasn't a name. It was a digital ghost.

"I am the architect of the sequence," she said. "My name was Dr. Aris Thorne. I am your great-grandmother. And you are the first person in four generations to be curious enough to find the key to the dome's back door."