Here is the list of the books in order of publication:
1. Clementine (2002)
2. Clementine: The Book of Acts (2004)
3. Clementine: The Family Jewels (2005)
4. Clementine: The Best Day Ever (2006)
5. Clementine: The Egret and the Elephant (2008)
6. Clementine: Too Many Things (2009)
7. Clementine: The End of the World (2010)
8. Clementine: The Last Straw (2011)
9. Clementine: Sisterhood of the Traveling Pants (And Other Stories) (2013)
10. Clementine: The World is a Little Scary (2015)
11. Clementine: The Mystery of the Magic Pen (2018)
12. Clementine: The Book of the Dead (2019)
13. Clementine: The Last Day of School (2021)
While the series has a chronological order, it is not necessary to read the books in strict order. Each book can be enjoyed individually as well.