Mark Twain & A to z Classics 
A Connecticut Yankee in King Arthur’s Court (Active TOC, Free Audiobook) (A to Z Classics) [EPUB ebook] 

With A to Z Classics, discover or rediscover all the classics of literature.
Contains Active Table of Contents (HTML) and ​in the end of book include a bonus link to the free audiobook.
This is the tale of a 19th-century citizen of Hartford, Connecticut who awakens to find himself inexplicably transported back in time to early medieval England at the time of the legendary King Arthur in AD 528.