I enjoyed this book up until the very end. It had a unique premise that focused on some version of time travel. The book was a very complicated mystery that really kept me guessing until the very end but the end did not leave me very happy because it felt to open ended to me and I felt like i needed more ending clarity for me. But the mystery really pushed this book foward for me and kept me on the edge go my seat wondering what was going to happen. I did like how the book tried to explain how time travel or world traveling could occur. It also showed how one person presence could really change a world so dramatically.
Overall I like the overall arc of the book with the characters and the world building but I did not like how it ended because it lacked the closure i would have wanted. It made me want more just so I could get my questions answered.
Check out my review Mash up the includes this book: