First the doctor, and now Levi Bell, the lawyer, know that the king is not Harvey Wilks, Peter Wilks' brother. The doctor calls him out as a fraud, but Mary Jane Wilks gives him $6,000 to invest for her and the townspeople believe in him.

Levi Bell first runs a test in which he gets the king to write something on a piece of paper and compares the handwriting to the real brother's, whose papers he has. The king comes up with a story, and then Levi Bell quizzes him on the tattoo Peter Wilks supposedly had on his chest. The king, for the first time, almost loses his cool, but says the tattoo is a thin blue arrow. Levi Bell knows this is false and a quarrel breaks out that is resolved by exhuming the body. Huck takes advantage of an opportunity during all the excitement to break away and try to escape.

Levi Bell uses the scientific method of testing a hypothesis to prove the king is a fraud, while the townspeople are willing to believe the king's story regardless.

As the lawyer for the Wilks brothers, Bell announces that he has letters that the brothers wrote to him.  He suggests that the King and the Duke write a few lines down on paper, and that he (Bell) will compare the writing and verify if the two men are who they say they are.

Of course, the writing doesn't match, but this doesn't stop the frauds.  The Duke turns the conversation to a supposed tatoo that was on the breast of Peter Wilks, and insists that the tatoo is there.  He insists that the townspeople exhume the body in order to verify the truth of it.  Amazingly, the town has been so won over by the frauds that they agree.