This book... destroyed me. When I hit the final quarter of the book, I legitimately couldn't put it down. I sunk an entire day into demolishing the last of the book and boy was it worth it. The characters made me feel so very much and I couldn't put it down. I really enjoy the way the science of time travel is handled, and the details of history were woven through in such a way that for the first time in my life I remember details. Kivrin is such a wonderful strong female character, full of heart and determination. The brilliant Mr Dunworthy is wonderful counter to her character as the two are essentially both the main characters and he makes you so very determined for Kivrin to be saved from the past. Absolutely recommend, even for YA readers, but be prepared for deaths of characters and experiencing both the horror and beauty of humanity. This is my first experience with historical fiction (which is weird since it's got science fiction too) but what an experience it was.