After Parker and the Avery Detective Agency leave Kansas, they are contracted to work in conjunction with the ATF and FBI on solving the mysterious oil trafficking case that is plaguing the area. The group is sent to Chicago in an attempt to get to the bottom of the crime ring that is terrorizing local farmers by confiscating oil from their land, but as they dive deeper into the case, figures from the past emerge, and the group might find that the culprit behind the whole thing is right under their nose.