After Mac blows up a dictator's nuclear plant, the Pentagon tells him to going hiding as a contract was made for him with repeatedly-bloody hit-man Axminster. So Mac finally decides to visit his maternal grandpa Harry Jackson, who raised him when orphaned, but suddenly left the teenager, taking a job in Alaska. Harry now lives in a desolate mountain cabin in Colorado, where he receives Mac, having failed to contact him in time to advise against coming. However Axminster's team wired Mac's place, so he can travel there with two jeep loads of goons to kill Mac and witness Harry. Mac finds out as they're shot at wile fishing, so they dodge, run despite Harry getting shot-wounded and manage to eliminate the fiends in batches by Macgyverisms.
—KGF Vissers