Edge of Yesterday by Tarah Scott and Sue-Ellen Welfonder
Almost always in time-travel or alternate-universe romances it's the heroine who goes back in time or gets thrown into a different dimension (Outlander being the most famous example). Usually, the heroine has to use her ingenuity to get by and the hero falls in love with her after she demonstrates some amazing modern skill (again, see Outlander).
This story is a really interesting take on that where this time, it's the man who gets sent back in time. Fortunately, he's a champion medieval re-enactor, which comes in handy when he manages to get himself into a whole bunch of lethal situations in the first few days of his stumble into 14th century Scotland.
I thoroughly enjoyed this story. Perhaps the only bone I had to pick with it is that Julianna and the rest of her family, along with everyone else, would have been speaking Gaelic and not English as the book suggests. Cailean, being Scottish himself, could very well speak just enough of the language to get by, but misunderstandings could have been introduced by the language barrier which would have added another layer of intrigue to the story.
That small quibble aside, I was absolutely fascinated and I'll definitely be looking for the next in the series! Five stars for a fascinating role reversal!
Disclaimer: I received an ARC of this book for review through ReadingAlley.