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Tom Baldwin is arrested by the NTAC for a crime he swears he doesn't remember committing; Shawn guides Isabelle through the things she missed in life due to her sudden transformation into an adult.
Tom and Diana continue to pursue the Nova Group; Maia starts school at the 4400 Center; Isabelle gains new insight into her role in the future.
Tom and Diana try to foil a kidnapper who's going after 4400 children. Meanwhile, Shawn's past comes back to haunt him.