4.5 starsJosie Byrne’s world is falling apart – her parents are splitting up and her boyfriend and best friend are hooking up with each other behind her back. With all of this happening, Josie has started to have some weird dreams. Every 12 hours, at 3:59, she dreams about an alternate Josie…one who has a boyfriend and has picnics in the park, one who has nice things, and loving parents. While looking into a mirror that her mom made her chase down at her dad’s condo, Josie sees something that makes her think that these dreams may not really be dreams. There in the mirror is Josie, but not really her. There are slight differences and Josie realizes that she is looking at herself in an alternate universe.Here is where the book really begins to get interesting. I will admit that at first I didn't really care for Josie, and I thought that if she continued to let everyone walk all over her as well as not do anything about what she was unhappy about I would want to punch her. Thankfully this doesn't last. As soon as she realizes what she is looking at in the mirror, she steps up and comes up with a plan to communicate with the other girl. When she does, she finds out the girl’s name is Jo and together they decide to swap universes for a day…I mean, what really can go wrong…right?When the switch takes place, Josie adjusts fairly quickly. Clearly things weren't as perfect in Jo’s life as she was led to believe. As a matter of fact, there is a lot off including the fact that Jo neglected to mention the things that go bump in the night…literally. No one goes out in the dark because of the Nox and Josie quickly finds out what they can do. Thankfully someone comes along and helps her out of the mess and all she can think about is going home to her own world the next day. Unfortunately Jo has other plans. Turns out, she moved the mirror so that Josie can’t get through it again and now Josie is stuck. Don't hate me but this is where I say you will need to go get this one when you can. A lot happens in this book and it is definitely an action packed, quick read. This mostly has to do with the fact that on top of the alternate universe thing there is a bit of a mystery to solve. I couldn't stop turning the pages as I needed to know what was going on and who was betraying whom. And while the science was way beyond my basic knowledge it sounded believable. I would have liked a less abrupt ending – don’t get me wrong, it kind of fits but I felt like something was missing…perhaps there is more to come? If you are looking for a different kind of story, check this one out. It has some solid characters and a great story that will keep you turning the pages.