Do you ever have one of those books that you really enjoyed but when it came time to write your coherent thoughts about it, you drew a blank? It's not that you found the book lacking or didn't enjoy it, to the contrary, I found myself extremely engaged in the goings on while I was experiencing the book first hand, but now that it's over I am struggling to properly review it. 
 Prenna comes from the future. A horrible, plague ravaged future that has rendered almost everyone either dead or trapped inside for fear of the disease carriers, the mosquitoes. Around 2091 (if my memory serves) a large conglomeration of citizens travel backwards in time (don't question HOW they can do this. They have the technology somehow) to 2014 to attempt to fix events that cause the future outbreak of the blood plague. But there are rules for time travelers. Confined to a highly controlled commune, Prenna and her fellow travelers must never tell anyone where they come from, must never allow themselves to be medically analyzed for fear of discovery, must never question the authority of the council and the leaders and above all else, must never form relationships with "time natives" i.e. people of the current timeline. High school aged Prenna finds this all extremely troubling, as the council seems more and more sinister and seem to know about things she told her fellow traveler Katherine in confidence. They are perfectly willing to let people die as opposed to receiving medical treatment, and certain friends of hers who question their authority even minorly end up mysteriously missing or have fatal accidents shortly thereafter. And Prenna is completely smitten by a time native boy named Ethan, a boy whom saw her arrive in this timeline several years ago and is completely entranced by her. 
 There are many unanswered questions and plot holes in this book. How can society have technological advances enough to travel throughout time but not be able to cure a plague or at least eradicate any and all mosquitoes? WHY is the council so nefarious? Why was Ethan able to see Prenna when she first arrived (this is technically answered but in a way that raises more questions about why Ethan is special). There are more plot hole ish questions I would like to go into, but that would involve spoiling things which I am dread to do. Because regardless of all these plot holes and questions I have, I wasn't bothered by them while I was reading the book. Yes, it's a bit silly that they can time travel but not cure a plague... I don't care. Yes, the council is nefariously evil for no real explained reason... I don't care. Yes, it is odd that Prenna's mother is very complacent and submissive when it comes to the health and safety of her daughter.. I don't care!! The story we are presented with is strong enough and focused enough that these overarching questions do not particularly bother me. 
 As Prenna is our point of reference character, it is her motivations that we are namely focused on. Given that she is a teenager and furthermore a teenager in love, this means that she is not laser focused on the overarching questions I mentioned earlier. She makes dumb decisions. She, ya know, acts like a teenager, albeit a teenager from a traumatizing timeline where most of her family was killed in a blood born plague of death. Tomato, tomahto. There were definitely parts of the book that were deus ex machina, such as Ethan's aforementioned specialness that let him see her appear, but again, I wasn't particularly bothered by this. I read this book looking for a highly entertaining YA sci fi story with a cute love story and I was extremely satisfied with what I received. 
 However.... WHY DID YOU END THE BOOK THERE I NEED MORE CLOSURE UGGGGGGGHHHHH