Jack's dad and his brother, who has been mentioned a few times as being in trouble are in this one.
Jack's dad is killed right in the beginning and this brings Jack's brother into town, after all how can a man who doesn't exist claim his father's body.
But Jack's brother brings into town a whole bunch of trouble, the kind of trouble Jack usually has to fix. So who can fix the trouble when it is Repairman Jack that needs the fixing.