This book was great in certain parts (the last quarter of the book, mostly), but I found the physics metaphors a bit heavy handed and repetitive. Most of the references to black holes and wormholes and dark matter etc. aren't literal, and after awhile it starts to wear on you. Also, the people in this story just sounded like the dirtiest humans ever and I couldn't picture anyone being okay with just having mud up to their ankles then walking around their kitchen (this happens)??? Plus they're constantly spilling vinegar all over the place/never showering, so that kind of threw me. I thought the little bits of German were cute, though, and I enjoyed the characters for the most part despite their hygiene issues. Once the story started to wrap-up, the sci-fi elements made a lot more sense, and I liked the way Gottie explained physics and mathematics in baking terms meant to help the reader understand what she was talking about. At times the writing was just a bit to poetic and metaphoric for my taste, as it mostly made it seem like Gottie was completely insane because nothing is said in straightforward way. I'm also reading another book about grief currently and just finished one up so maybe this book wasn't right for me at this exact moment, but overall I'd recommend giving it a try, especially if you like your YA romances to be confusing.