A novel about a future where eternal life is possible, and identities can be chosen. In the indeterminate future in an unnamed city, physical impediments to immortality have been overcome. As society approaches the prospect of eternal life, a new problem must be confronted: with the threat of the brain's storage capacity being overwhelmed, people want to move forward into the future free from redundant, unwanted and interfering memories. Rejuvenated bodies require rejuvenated identities--all traces of a person's past are erased and new, complete fictions are implanted in their stead. On occasion, though, cracks emerge, and reminders of discarded lives seep through. Those afflicted suffer from Leaked Memory Syndrome, or Nostalgia, whereby thoughts from a previous existence burrow in the conscious mind threatening to pull sufferers into an internal abyss.