The Sisterhood of the Traveling Pants is a bestselling young adult novel by Ann Brashares published in 2001. It follows the adventures of four best friends — Lena Kaligaris, Tibby Rollins, Bridget Vreeland, and Carmen Lowell, who will be spending their first summer apart when a magical pair of jeans comes into their lives, turning their summer upside down. The book was adapted into a film of the same name in 2005. Four sequels to the book have been published, The Second Summer of the Sisterhood; Girls in Pants: The Third Summer of the Sisterhood; Forever in Blue: The Fourth Summer of the Sisterhood; and Sisterhood Everlasting.