"You should be able to do your Cloak of Invisibility and still end up with the book (or book facsimile) in your hand at the end. "
Only a slight correction, Spellbinder. The effect that I do is actually known as "Jolly Roger's Cloth of Invisibility." It is the illusion that created quite a few Rumbles when I revealed it in my lecture at Blackpool last year. In the Harry Potter stories it is a "Cloak of Invisibility." Naturally I took the name from there. However, you are quite correct that I can be holding the new book "Harry Potter and the Deathly Hallowes" in my hand when the cloth drops. This would certainly work, and might be the solution to the problem!
I took a look at your website just now, and I am most impressed with some of the stuff you have on there. I admire your creativity. I can bet you that you can go to the dollar store, spend twenty bucks, and come away with a better act than someone who has spend thousands on the latest and greatest illusions. It is all in the presentation.... right? JR