Even though Royal Road is a bit dated nowadays, especially in terms of the patter suggestions ('Will you assist me, sir? I must make two conditions, however - first, that you will not at any time name your card or give me any indication that I have discovered it; second, that when you cut the cards, as I shall instruct you, you will say to yourself, 'This I cannot fail to do.' That, of course, is an application of the principles of Dr. Coue, the eminent...' Blah blah blah etc. etc. etc.
) it still has lots of great stuff in that, with a bit of thought, can quite readily be adapted to a modern audience. So be sure to give it some attention nevertheless!