Jurassic Park by Michael Crichton, or Persuasion by Jane Austen. If you have a chance, read the annotated Persuasion compiled by David Shapard. The text runs down one side of the page, and relevant facts about what society and politics were like during that era run down the other page.
tell us what you think is the best book of all time
Well...define best? A certain religious text that goes by the title "The Holy Bible" blows out all best selling competition.
If best book is personal favourite then that would be Return of the King of the The Lord of the Rings series.