Seventeen-year-old Skylar has been haunted for as long as she can remember by fleeting yet powerful sensations that something is horribly wrong. But despite the panic attacks tormenting her, nothing ever happens, and Sky’s beginning to think she’s crazy. Then she meets a mysterious, otherworldly boy named Win and discovers the shocking truth her premonitions have tapped into: our world no longer belongs to us. For thousands of years, Earth has been at the mercy of alien scientists who care nothing for its inhabitants and are using us as the unwitting subjects of their time-manipulating experiments. Win belongs to a rebel faction seeking to put a stop to it, and he needs Skylar’s help--but with each shift in the past, the very fabric of reality is unraveling, and soon there may be no Earth left to save.

Ever since she was a kid, Skylar gets feelings or sensations of wrongness from the most normal things. When she freaks out about a bomb that no one saw and disappeared as quickly as it appeared, she feels like she has completely lost her grip on reality. And then she meets Win, a mysterious boy who somehow knows about the bomb that came and somehow understands her 'panic attacks' completely. After being chased by a group of otherworldly-looking humans carrying weapons Sky had never seen before, Win admits that he is a time-travelling alien rebel hell-bent on stopping scientists from his planet who are experimenting on earth.

Win tells Sky that the sensations of wrongness that she gets are the effects of shifts in the time rift caused by time travellers and takes her back in time to different countries in search of missing pieces left behind by their rebel group's MIA leader- pieces to a device that will stop the aliens from messing with earth's timelines.

Earth & Sky primarily caught my attention because of its Doctor Who vibes. Time traveller picks up a female companion to help him save earth? Sounds like a fun read, right? Unfortunately, the book wasn't as exciting as I expected. Yes, the plot was pretty interesting but I think that the whole concept of a species from another world manipulating Earth just wasn't explained clearly enough. It just didn't sell for me because of that and I found myself stumbling over sentences and getting confused a lot. The world-building was just too weak to hold a massive plot like that.

Sky was a pretty boring protagonist and Win didn't really stand out much for me. I didn't feel a connection with them at all. They went through this cycle of travelling to a timeline, getting chased, finding the piece they need, getting chased again, and returning to Sky's timeline to rest. It got pretty repetitive after a while because there weren't any wow moments that heightened my excitement. I did really enjoy the first part of the book because it started so high, but it just didn't go anywhere after that. Earth & Sky had the makings of a great read, but I think that it just tried to accomplish too much that it fell short in the end.