The Sisterhood of the Traveling Pants by Ann Brashares is a book about the lives of four teenage girls.  Bridget, Carmen, Tibby, and Lena call themselves the Septembers.  Their moms were best friends during pregnancy so they were all born in September and grew up together, sharing experiences and holding valuable places in each other's lives.

While on a shopping trip one day, Carmen finds a pair of jeans in a thrift store. She never wears them and is ready to get rid of them when Tibby discovers the jeans in Carmen's closet.  One by one, Tibby, then Lena, then Bridget, and finally Carmen try on the pants.  Miraculously, the pants fit everyone beautifully, despite their varying sizes and shapes.  The pants, they decide, are magical.

At their annual break-in to Gilda's Gym, where their moms had first met in an aerobics class, they decide the pants will keep them close at heart even though they will be miles apart for the summer.  They make rules regarding the proper wear and care of the pants, and plan to send them to one another so each may have a magical adventure in the pants. They mail the jeans between Washington D.C., Greece, Baja California, and South Carolina all summer long. 

At soccer camp Bridget learns a difficult lesson about being physical with a boy.  In Greece, Lena discovers that if you want something or someone bad enough you have to do something about it.  After leaving South Carolina, Carmen figures out that no matter how her father's life has changed since the divorce, he will always love her as his daughter.  Tibby, though she stayed home in Washington D.C., discovers a lot about life and friendship when a loved one reveals that she has Leukemia.  At the end of the summer the girls all meet again at Gilda's and write the story of their summers on the pants.

This would be a great book for teenage girls.  The characters deal with male/female relationships, changing friendships, death, and growing up.  The Sisterhood of the Traveling Pants illustrates the changes that most adolescent girls deal with.  This is a great book that keeps you on the edge of your seat.