The Memory Book by Lara Avery
Sammie has Neimann-Pick Type C, a disease that destroys her memory, then her entire health. Sammie needs a plan - to ace the debate final, graduate at the top of her class and get into NYU, but as she starts losing her memories, she creates The Memory Book. Addressed to "Future Sam", The Memory book is basically a collection of informal letters from Sammie to herself, including notes and conversations from other characters in Sammie's life.
I really liked the format of this book, it felt like a well put-together story, but it was also personal like a diary to herself and it felt as though we were inside the main character's head, which at times was difficult to read as her health deteriorated. I loved all of the characters within the book, especially Coop who became one of my favourites. I did feel as though the ending was slightly rushed and the conclusion with Coop (no spoilers) was kind of thrown-together and not well fleshed out and I would have enjoyed more of a conclusion to the Stuart storyline.
In general, I really liked The Memory Book, it was a heartwarming and heartbreaking look into a rare illness that I personally hadn't heard of before. It educated me and shook me to my very core. I love Sammie and will definitely be reading more from Lara Avery in the future.