In Manitoba, Hugh and former Polar Industries dispatcher Vlad Pleskot have set up a competing trucking company, VP Express.
All three Polar drivers set out from Winnipeg with construction supplies: Alex and Lisa to Bloodvein, Darrell to Berens River.
Darrell slides badly on patches of deep snow, then eases over a river crossing despite his misgivings and brings his load in.
They decide to give Art one more chance to prove himself, as part of a convoy with Hugh and Todd to haul assorted supplies to Wasagamack.
Lisa sets out along the newly opened, slick, bumpy road to Oxford House, hauling a grader whose blade keeps swinging out over the side of her trailer.
Hugh sets out early for Wasagamack with a load of bridge parts, wanting to make up for lost time on VP's contract.
Lisa, bringing a school bus back to Winnipeg, is very nervous about crossing so soon after him due to the stress on the ice, but eases safely over the river to finish her run.
Todd's heater fails, causing frost to build up on the windows, but he sets up a hair dryer to thaw them out and keeps driving to reach Wasagamack not long after Hugh.
As VP lines up more contracts, Vlad gives Art one last chance to show his ability as part of a convoy to Tadoule Lake with Todd and a free-lance driver, Derek.
The explosion sends sulfuric acid into Todd's and Derek's faces; to get medical attention, the convoy must backtrack 80 miles to Lynn Lake.
Yuri, one of Polar's drivers, quits to join VP and Lisa gets his load: building supplies that must reach Bloodvein by the end of the day.
When he refuses to move, the police are called in to escort him off the property; the delay costs Lisa two hours and forces her to hurry up the road.
He clamps off the leak and spends the night in the smoky truck, then continues on the next day and brings in his load to close out the contract.
Arriving that night, she finds the trailer's latch frozen solid and the tires stuck in ice, but it comes free after some effort.
The ice over Fishing Lake has weakened due to higher-than-normal temperatures, putting her nerves on edge as she crosses it on the return trip to reach Winnipeg.
Polar picks up a contract to haul 10 loads of construction supplies 680 miles to Utik Lake, over a road that is not monitored by government crews.
Once they arrive, he drops off the camper and picks up a loader bucket, attaching several heavy tires to his trailer in order to drag over the road and smooth the surface.
They get stuck in a dead end with no room to turn around, but Art calls in a nearby loader to clear the area so they can double back and keep driving.
As spring approaches in Manitoba, both VP and Polar scramble to move needed freight before the ice roads melt.
The sound of shifting ice sets her nerves on edge as she crosses the lake late that night to make the delivery.
The next morning, he wakes up feeling ill and finds several broken tire chains, complicating the start of his return to Winnipeg.
Hugh takes a firetruck north toward Wasagamack, but not before he and Vlad park it in front of the Polar depot with sirens blaring to annoy Mark.
Darrell's truck is back in service, and he is dispatched to move it, with Lisa taking support scaffolding and a pilot car to guide them along the narrow road.
Once Hugh and Todd finish the season's last runs to Wasagamack, they load up and start for God's Lake, driving into the night to save time.
Darrell and Lisa find many melting patches on the road as they drive and skid badly on corners, but reach God's Lake at night.