Caitlin is taken, but her kidnappers don't want money - they want Nelson.

While a winter storm hammers Yellowknife, a couples' weekend in Calgary goes sideways after the arrival of Blake's sister and Krista's discovery of Bobby and Petra's kiss.

Krista's mother pays a visit to Yellowknife and throws Krista's life into turmoil and Bobby gets his first real chance to play "family" with Connor and Petra.

Bobby and Mel are stranded in an isolated community after their DC-3 is shot up on the airstrip; and Krista helps Loreen arrange a traditional burial for the bones of her great-great-grandfather.

Troubled rock star, Delilah Fury, embarks on the northern leg of her comeback tour, and Bobby must keep her - and the tour - from falling apart.

Petra thinks her ex husband has abducted Connor and enlists Bobby's help to get him back, leaving Krista on the hook to plan a 35th anniversary party for Arctic Air.

A dying trapper gives Dev and Cece the location of a valuable gold claim, setting off a mini gold rush that pits Arctic Air against Bruce Ward and the Comstock Brothers.

A desperate biologist holds Krista and Bobby at gunpoint in the Arctic Air offices, along with a polar bear.

Bobby backs Jim McAllister in a tough-guy boxing tournament as part of a last-ditch bid to save his diamond claim; and Arctic Air falls into crisis when Blake's friend joins the crew.

Bobby, Krista and Blake are trapped in an abandoned Dew Line station - only to find out they're not alone.

Bobby and Caitlin fly into northern hunting grounds to see Nelson, but a long-awaited brother-sister reunion turns to horror when they learn that Nelson was shot by the very hunters he was hired to guide.

Bobby's sister Deanna is arrested for eco-terrorist bombings, but as Bobby works to clear her name, he learns that there's one more bomb and it's been planted on an Arctic Air plane -- with Krista aboard.

Bobby and Krista attempt to rescue a group of stranded tourists from a raging forest fire, but they need help from the rest of the Arctic Air crew if they're going to make it out alive.