Question

How did Dancy take a 'tenner' from De Levis?
How does De Levis later connect this trick with the theft?

Answer 1

Dancy took a 'tenner' from De Levis by jumping on to a bookcase four feet high and took ten pounds from De Levis who sneered at him for making money by parlour trick.
Later when De Levis' money is stolen, he openly accuses Dancy by saying that the rail of his balcony and the rail of the next (which was of Dancy's) were seven feet apart. So if a man could take a standing jump onto a narrow bookcase four feet high then he could easily jump from his balcony to the one of De Levis'.