Fore Shadows: Escape 2169 (A Society in the Shadow of Civilization Short Story) - Society in the Shadow of Civilization, #3

"Paranoia is a mild state, relative to the one I found myself existing in after vaccinating the Colony."Once he saved the Colony's population from a deadly virus, Dr. Samuel Marks knew the U. C. E. would uncover how his friends accomplished their mission. The lab's vaccine was a lie; Samuel's own unsanctioned research yielded the miracle cure and when the U. C. E. discovered it, they would take it.
But, his tree was the only hope everyone he cared about had for survival; he had no other choice. Samuel did what had to be done, and now the only option he and his friends have left is to Escape 2169.