Disciplined and pragmatic, Mary Roberts feels she's got her life under control. She's recently moved to Hobart, she's nearing the end of her training as an emergency doctor, and she keeps a tight handle on the wellbeing of her mother and her sister back home in Sydney.

But when it comes to her long-term boyfriend, Felix, Mary's always had a blind spot. That is until she finds another woman's G-string in their bed ...

In need of a temporary escape, Mary signs up to help run a wilderness expedition medicine course. She soon discovers that rock climbing, plunging into freezing cold water, and working in the close company of a grumpy yet disconcertingly magnetic retrieval doctor is pushing her way out of her comfort zone.

Suddenly, everything she thought she knew about herself is starting to unravel. The question is, what will the fallout be? A breakdown in her relationship with her sister? Her mother's brittle mental health reaching the point of catastrophe? Or - most dangerous of all - could Mary Roberts finally be ready to fall in love?