Mark Kaminsky is kicked out of the FBI for his rough treatment of a suspect. He winds up as the sheriff of a small town in North Carolina. FBI Chief Harry Shannon, whose son has been killed by a mobster named Patrovina, enlists Kaminsky in a personal vendetta with a promise of reinstatement into the FBI if Patrovina is taken down. To accomplish this, he must go undercover and join Patrovina's gang.

Mike and Reggie continue to hunt the mysterious Tall Man, discovering along the way that the invasion has already begun.

A former FBI agent turned small-town sheriff agrees to help the FBI chief infiltrate the Chicago mafia when the FBI chief's son is killed by them.