They Both Die at the End is a book filled with roller coaster emotions. It follows the story of two boys, Mateo, and Rufus. They are both dying. They connect through this app to spend their last day alive with each other. Their relationship at the beginning starts off as strangers. That slowly turns into something more than that. I love how the author connects all these different people in the story. The ending is very abrupt, and I feel like the author could add some more detail. The author developed each character wonderfully with many details. Overall the book was hard to put down, and it ended up teaching me some life lessons.