For a large part of this I really enjoyed it for what it was - a quirky, original YA take on a reincarnation/past lives love story. I love, love, love past life love stories, and this combined that with historical events and even better, the leading man was Scottish? Sold. 
 Or should have been sold. 
 The story involves Matthew and Katherine (or Matt and Kate/Katy/Kit) and we see them in various time periods - present day (2039), during the Crimean War, in Carlisle prior to the Jacobite Uprising and see the journals and notebooks and letters from them from 2019. We cut between each period and after each glimpse we get a status report about what we have just read from some sort of computer system. It's actually quite an original way of telling the story and I really enjoyed the formatting of it. 
 The historical portions are filled with glaring inaccuracies, but I was willing to overlook them - it's a YA novel and I can accept liberties being taken for the sake of a good story, and for large parts of the book, it was a really good story, I thought. I was very happily going to award it 4 stars for being such a fun read. 
 Unfortunately though, the ending...for the author to put so much good work into the story, to come up with such an original concept, for the ending to be so rushed and for no real resolution to be given is unforgivable for me. I understand that there is going to be a sequel, and I will read it, but even if the whole point of this was to set up that book, you cannot cover 9 months in one chapter then skip to an epilogue that makes no sense. 
 I don't know. Maybe I am judging it too harshly, but for me, it's frustrating because I think it had so much potential, but then the rushed ending completely undersold it. It felt like it wasn't intended to be a series, but the book got away from her so it lacked any real direction. I will read the follow up to try and get some answers, but I can't help be a little disappointed right now.