I found this book a slice of YA magic, the kind that makes this grown-lady's heart melt. Sure, it's about love at first sight, which is a controversial topic to say the least, and sure, that much action probably could not happen in one day in NYC (I mean, have you ever traveled those distances in that city on mass transit?), and the timeline borders on unbelievable, but, BUT, I didn't find that those things took anything away from the story. Love at first sight is just the way some people operate, especially inexperienced teenagers, and I loved the NYC Yoon describes here. I especially enjoyed that Daniel is the love-minded poet and Natasha is the science-minded brain, characters Nicola Yoon draws distinctly while never making either one apologetic for their perspectives. Yoon is a brilliant writer, weaving seemingly disparate stories, ideas, and history throughout the book. And guess what? Unlike far too many adult literary fiction novels I have read in recent years, it all comes together in the end. The ending is a punch to the gut--a tears-springing-to-the-eyes, satisfying punch. I really liked Yoon's debut, Everything, Everything, but I am floored by this, her second novel.