In this book, Boris offers you his amazing version of this mythical routine. Here is the effect:

A prediction deck is introduced before anything starts and remains in the card case until the end.

A first spectator freely names any number: his birthday or a number from 1 to 52 depending on the variation you perform. He can say any number. No restrictions. No force or equivoque. Totally free choice. 

A second spectator freely names any playing card from a deck of fifty-two. No restrictions. No force or equivoque. Totally free choice. 

A third spectator takes the prediction deck out of the case and counts down to the named number by turning the cards face up one by one. The freely named card is in the position of to the freely named number! It is as simple and direct as that!

The performer does not touch the cards. He does not even open the card case. The spectator does everything. The card is always revealed at the exact named number...