The Sisterhood of the Traveling Pants is a young adult novel that follows four friends Lena, Tibby, Bridget, and Carmen during the summer after their sophomore year of high school. To stay in touch while they spend the summer apart, they share a pair of pants which miraculously fits all of them despite their different body types. Each girl has her own adventures and grows up a lot over the course of the summer, but the power of the pants and their love for each other ensures that their friendship remains strong.
The most popular website for book notes. SparkNotes was created by students for students, and their summaries are accessible and extremely well-written. Besides the usual plot overview, chapter summaries, and character analysis, SparkNotes differentiates itself with a section discussing themes, motifs, and symbols.
Their book summaries aren't as good as other providers, but PinkMonkey often has interesting insights that aren't mentioned elsewhere on the Internet. For example, they go over literary elements (like setting, conflict, and mood), compare and contrast, and symbolism/motifs. It's a good site if you want to find a unique fact or angle that other students don't know about.
Includes the standard sections found in most book notes, including a book synopsis, chapter by chapter analysis, author biography, character list, essay topics, book report ideas, and study questions. This website is less comprehensive than other book notes sites, but could be useful if you're looking for a quick review.