Book 1
Sisterhood of the Traveling Pants
Ann Brashares
Book 2
The Second Summer of the Sisterhood
Ann Brashares
Book 3
Girls in Pants: The Third Summer of the Sisterhood
Ann Brashares
Book 4
Forever in Blue: The Fourth Summer of the Sisterhood
Ann Brashares
Book 4.5
3 Willows
Ann Brashares
Book 5
Sisterhood Everlasting (Sisterhood of the Traveling Pants)
Ann Brashares