Mairie MacAlister was rescued from death in the 13th century and taken to the modern day, where she has lived for nine years. Unfortunately, Mairie doesn't quite fit in today's world - she doesn't have the Fae powers of some of her relatives because she is the daughter of a son of Prince Pol, and his powers only travel down the line of daughters of daughters. She knows that she would have died had she remained in the 13th century, but she's troubled by the thought that her cousin Marsali did die as her name disappears from the records. Mairie decides to do something about this and speaks to the Fae Prince Pol to convince him to right the ancient wrong of only daughters receiving his powers, then travels back in time to try to save Marsali.

When Mairie doesn't return, her friends realize that something has gone wrong with her time travelling. They send Guardian Ramos Navarro/Servans to help her. Ramos is trying to make up for the evil that his father has committed over the ages, and he is happy to help Mairie. However, when he arrives he discovers Mairie isn't exactly what he imagined, having far more fire and self-reliance than he expected. He also discovers that there are some Fae goings-on in the 13th century, and that Ramos may have the opportunity to deal, once and for all, with his evil father. But what will that do to himself? And is his destiny somehow linked to Mairie's?

Soul of a Highlander was an enjoyable story set in an interesting and difficult time, when medical treatments were basic, food was unappetizing, and lives were often violent and short. Mairie and Ramos are both appealing characters as they try to help others while not always understanding the Fae powers working with them. They just slide into a fairly low-key romance, but the overall story is well-written, even if some of the 13th-century Scottish characters speak American English at times. This is clearly not the first book in a series, but it's easy enough to pick up the story and follow the events after the first few chapters, which rather throw information at the reader. This is a pleasant enough paranormal story set in an interesting time and location.