When a flight that went missing in a wormhole twenty years ago finally reappears, a distant workaholic father who was on board reaches out to his now-grown son by email.

In the wake of a life-altering event, Anna has returned to work and written a standard, dry academic graf on self-driving cars—which, in 2042, have become the standard mode of transportation. Her paper's footnotes, however, reveal a tragic story.