Which two books of Mark Twain are the best?

My suggestion is "The adventures of Tom Sawyer" (fiction) and "A murder, a mystery, a marriage", should be the most famous books among. The Tom Sawyer one I read since I was a kid but then I read again few years ago, it's still a funny story. The second one that I suggest which is suitable to adult!

Here below is the information of Mark Twain and you can find more works of him!
http://en.wikipedia.org/wiki/Mark_Twain

Mark Twain is one of the famous American authors, his books are always in our reading lists, I think the two popular books for the young readers are The adventures of Tom Sawyer and The adventures of Huckleberry Finn.

Also, The Prince and the Pauper, and Life on Mississipi are very good story books, the school librarian suggested we read that too!