Matt Mackay is an equine veterinarian living in Glasgow. His marriage has just ended, leaving him devastated, yet he carries on with his work despite his worsening mental health. You don't talk about that sort of thing where he's from. However, he will have no choice but to face it.

Gailleann is a wild Highland pony from Scotland's far Northwest. One day, she is captured by humans and ripped away from her beloved mountains and glens. Scared and confused, she fights domestication but finds herself being sold from one home to another. She must learn how to understand the humans, but will she ever fully accept them?

Matt comes across Gailleann when she's owned by one of his clients. Their lives intertwine, but can a broken horse and a broken man heal one another?