The Beast in the Jungle is the story of John Marcher, a man preoccupied with the idea that he will be slain in a dramatic fashion. This foreboding dominates his life, lying in wait in his subconscious like the eponymous beast, and causes him to squander the affections and attention of May Bartram. John does not realize that the calamity he spent so long anticipating was in fact his own inability to settle down and love May in return.
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.