Amazing secret and super functional. Makes it so you have no worries on sleights or being called out, so you can truly focus on presentation. The single book effects are superb, but the multiple book effect takes it to another level. I've modified handling to where the spectator can legitimately pick any book and think of any page number and you still know the word without touching the book they selected. Absolutely floors people. Takes the mentalism feeling to a whole new level. To them you are no longer doing magic tricks, you are now a true mind-reader.