Pericles is a Shakespearean play about the Greek, Pericles, who flees by ship from Antiochus, who presented him a riddle that would have resulted in his death either way. Pericles shipwrecks near Pentapolis, marries the king's daughter, Thaisa, who, after giving birth to Marina, is accidently thrown overboard in a storm, survives and becomes a priestess of Diana. After beautiful Marina is kidnapped, sent to a brothel, maintains her virginity by becoming a tutor instead, Pericles finds her and, later, Thaisa.
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.
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.
This is a good choice if you're looking for a quick read or refresher rather than an in-depth analysis. You'll get a brief book summary and chapter by chapter breakdown. The website loads quickly with minimal advertising.