For her entire life, Mia has seen colors when she reads and when she hears sounds. When she was little, she tried to explain his vision to others, but when she realized that she was alone and that admitting what she saw made her a "freak" in their eyes, she kept it to herself. By then things change and her condition comes out and she discovers that, while rare, that Synthesia is something that is not unique.
It's been a bit of a dry spell lately since I found a really good book. And it's a good thing to find. Mass's Leap Day was interesting and original, but this story is truly a much better read. The book appeals on all sorts of levels, not just as a story about Synthesia (which I knew nothing about before reading this book), but also as a coming-of-age story and a story about the bond between cats and their owners (an important part of the plot I sort of skipped above). This is truly an excellent book.