3.5 stars 
 This book wasn't even on my radar, but I just happened to win a giveaway over at A Book Vacation (Thank you! Thank you!), and I jumped at the chance to give this book a try! Overall, this is going to be a book that so many readers will fall in love with. It has a touch of paranormal, a dash of awkward teen romance, and a whole lot of mystery. 
 Just reading the synopsis should clue you in on this not being a happy read. Marshall's twin brother is dead, and what's left behind is an abundance of guilt and regret. It couldn't be further from a happy, fluffy, love story, but I still found myself with a small ember of hope growing, that just maybe Marsh could come through his grief intact, that he could connect with the new girl, that he could remember how to be happy. It's that hope that kept the story moving forward. 
 This was really well written from a male pov, without being too girl-crazy, or sports minded. I find it is often too easy for a female author to fall into this stereotype when writing male characters. If anything, it was the female characters that I felt lacked something. The girl-next-door, Maddie, is supposed to have this whole back story, but I never felt like it was enough. The school guidance counselor was also a little weak. I loved Marsh's mother most of all. While she wasn't a huge character, I could tell exactly how much pain she was in by the way Casella portrayed her movement. 
 This book hints at a supernatural theme more than it actually participates in it. This is NOT a bad thing! I was left in a constant state of uncertainty, and it kept me wondering. I wasn't sure if they would ever actually find a thin space, or if just the idea of it was enough. The very concept of thin spaces if fascinating! Researching it afterward was absolutely an enlightening experience. It is said that thin spaces are marked out by rock cairns or hedges by the ancient celts. I can't help but wonder about Stonehenge. I admit... if I ever get to Scotland, I may be seen slipping off my shoes... 
 My only real regret with this book was that I was able to have it all worked out by halfway through. I wish I hadn't tried so hard to figure out how it would end, because it kind of spoiled it for me. My advice would be to just sit back and enjoy the story for what it is: a journey through love and loss.