The team investigates the murder of a tech entrepreneur turned venture capitalist who secretly developed a daemon, a background computer program that allows for undetectable data collection.
The 4400 are attacked by a series of bombings after Barbara Yates makes their names and addresses known to the public. Tom, Diana and Dennis try to put an end to the bombings, while at the same time Tom is coping with Kyle's erratic behaviour.
Warren Lytell, an agent from Washington is sent to "monitor" the team's progress on the 4400 investigations. Jordan Collier offers protection to members of the 4400, while Richard and Lily begin to question his motives.
A feud escalates between Brad and Randy when Brad expresses an interest in the school newspaper, and his silly sports article outshines his younger brother's much more thoroughly researched topic. Meanwhile, Tim manages to throw himself out a window during a Tool Time episode, and he and Jill must deal with a tax audit at home.moreless
During a high-profile serial murder case, an old mentor of Tony's becomes involved with the investigation.