I remember hearing about THE SQUARE ROOT OF SUMMER months ago, and I was immediately intrigued! A contemporary romance...but with time travel. Super interesting! It's not often that contemporary and science fiction mix in that way without the sci-fi taking over, so I was extremely interested to see how the story was going to be handled, especially when you add in the fact that the main character, Gottie, is a math genius! Turns out that Harriet Reuter Hapgood handled it in a completely unique way, and once I started reading it, I couldn't stop! 
 There are so many things to love about THE SQUARE ROOT OF SUMMER, but for me one of the best parts was the fact that the story is so mult-faceted! Right from the description, it's clear that this story isn't just about first love, it's also about loss, heartbreak, falling in love again, and time travel, too...and once I started reading, I realized that while parts of it were definitely light-hearted and fun, it was also an incredibly introspective story. I do love light and fluffy contemporary romances, but I also love the stories that wrench your heart a little bit and make you appreciate the things in your life, and this story really does that. 
 When the book starts, Gottie is so detached from life and she's spent the last year not really processing or moving on. I loved seeing her begin to open up to the world, and to embrace life again. I'm a huge time travel fan, and I'm so used to people actively traveling through time or unintentionally lapsing into time and making irrevocable changes when they do, but this story wasn't quite like that. In fact, I wasn't really sure what to expect with the whole "time travel" aspect of this story since it is still mostly a contemporary story, but I still really enjoyed it. There was a whole hypothetical and theoretical side to time travel that was extremely unique, and Harriet Reuter Hapgood described it all in a super interesting way! You definitely won't learn how to time travel yourself after reading THE SQUARE ROOT OF SUMMER, but you will love reading about Gottie's experiences with it! 
 I spent over three years working in a German deli, so I have to admit, all of the German elements to this story made me smile so freaking much...and they made me really nostalgic! I especially loved the little bit of German that slipped into the dialogue. :D Along with the time travel and German bits, I also really enjoyed the characters! While Gottie was pretty distracted with the whole weird time travel outbursts and wasn't always quite "in" the present, I really enjoyed her interactions with her family and friends when she was. I loved her dad, and the bits we saw of her grandpa, Grey, were so fantastic, too! I also loved her dynamics with her brother, even more so once she started to become less stuck in her past. Most of all, I really enjoyed seeing everything between her and Thomas though!!! Super duper cute and sweet...and I also loved her cat, Umlaut (hehe more German goodness! :D). 
 Overall, I absolutely adored THE SQUARE ROOT OF SUMMER! I loved how the time travel aspects of the story complemented the contemporary parts, and I really loved Gottie's growth throughout the story. I'd recommend this one to contemporary romance fans, especially if you find the idea of time travel fascinating, too!