Kimble arrives in the factory town of Hempstead Mills, West Virginia to assist Andrew McCallister, his longtime mentor who is dying from lung cancer which confines him to a wheelchair. McCallister's vigorous anti-smog campaign has earned him a reputation as a local crackpot. But the old man plans to go out with a bang; by having a bomb hidden in a package which he has Kimble deliver to the local factory. But when McCallister discovers that a group of school children will be inside the factory during a school tour at the time of the explosion, he dispatches Kimble to evacuate the building and deactivate the bomb before time runs out.