Tom and Diana try to foil a kidnapper who's going after 4400 children. Meanwhile, Shawn's past comes back to haunt him.

Tom and Diana continue their search for a mysterious kidnapper who is targeting 4400 children, while Shawn's relationship with Isabelle causes concern at the Center.

When Shawn is attacked by the Nova Group, a shaken Isabelle decides to seek revenge. Meanwhile, a youthful 4400 offers Alana some information about a tragic incident from her past.