Natalie Babbitt's fantasy novel Tuck Everlasting tells the story of 10 year old Winnie Foster, who meets a boy names Jesse Tuck who claims to be 104 years old. Jesse reveals that him, and his whole family, gained immortality from drinking from a magical spring. Winnie learns to love the Tucks, and is forced with the hardest decision she'll ever have to make: a normal life, or one of immortality with Jesse.
Boasting the largest collection of book summaries, BookRags is the best option for titles you can't find elsewhere. They offer all of the basics (quotes, chapter summary, characters, historical context, literary criticism) but also walk through a few major topics that recur throughout the book, which can be particularly useful for essay writing.
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.
If you're bored by traditional book notes, try Shmoop! They write their summaries in an approachable, entertaining style. Their comprehensive offering includes chapter by chapter summaries, themes, quotes, character analysis, study quizzes, and even flash cards and infographics.