Diana finds her sister, whose life is in danger due to promicin. Elsewhere, Shawn considers a run at public office.

Tom tracks down Collier, who is living in a small town with his followers. Meanwhile, Maia has a disturbing glimpse of the future.

Collier tries to persuade Shawn to join his movement. Meanwhile, a 4400 who knows the truth behind historic conspiracies goes missing, prompting a search by Tom and Diana.