For MMGM, I am recommending A Mango-Shaped Space by Wendy Mass.
Here's the publisher's description:
An award-winning book from the author of Jeremy Fink and the Meaning of Life and The Candymakers for fans for of Wonder and Counting by Sevens
Mia Winchell has synesthesia, the mingling of perceptions whereby a person can see sounds, smell colors, or taste shapes. Forced to reveal her condition, she must look to herself to develop an understanding and appreciation of her gift in this coming-of-age novel.
I love this book! One of the best parts of this book was getting to learn about the rare condition of synesthesia. The book is clearly well-researched, and readers will learn about synesthesia’s qualities, both good and bad. The book also has interesting characters with strengths and flaws. Although Mia makes mistakes throughout the book, she is still a good person who readers will like. The book deals with many complex themes, such as how people deal with death and how much people can care about pets. The book never slows down, with various events constantly happening that affect Mia in different ways, changing her immensely by the end of the book. Different parts of the book may show Mia’s relationship with her siblings or her friends, her dealing with synesthesia, or her dealing with the loss of her grandfather. This book is both heartbreaking and incredibly enjoyable, and every reader will love it by the end!