Krista is returning after three months of travelling in Southeast Asia. She has been profoundly affected by the experience, and is determined to make fundamental changes in her life - a decision that will have important consequences for those closest to her. Meanwhile, Mel is taking stock of his life and wondering if it's time to hand the company reins to someone else and get back to his first love: flying. Bobby is finding himself drawn all the more closely to Petra and Connor, with shocking and unexpected consequences when his enemies attempt to follow through on their threat against his life. And there's the potential for new romance - and new adventure - in Blake's life, when police Constable Lindsay Gallagher transfers to Yellowknife.

Bobby fights against time and politics to evacuate a community before an upstream dam bursts.

Krista and Tag's relationship is tested when an emergency landing leaves them stranded.

A high-stakes plane race raises ghosts from Mel's past, forcing Krista and Tag to confront a crisis in their relationship.

Bobby fights to save Petra's life savings when Bruce Ward's involvement in a business deal causes violence and destruction.

Krista faces a grisly choice when her team attempts a life and passing rescue.

Bobby and Loreen race to save Caitlin when her first solo flight goes dangerously wrong.

A prisoner transport becomes a life and passing struggle for Blake and Lindsay, as Krista and Tag reach an impasse in their relationship.

Bobby and Connor are forced to fight for their lives during a weekend bonding adventure.

Bruce Ward is blamed for Bobby's foster sister's alcohol-related passing in the dry community.

Krista's SAR crew is pushed to the limit during a high-altitude rescue, while Bobby is the target of an attack in YK.

When disaster strikes, Krista's SAR team is trapped, and Tag clings to life on the mountain; Bobby and Mel race to save them.