short explanation:
USE TWO DECKS
One svengali and one normal deck (both matching)
before starting, place on your knee (well balanced) the normal deck from witch you have taken away before hand, the forced card
1) Prediction:
take a paper and write a card prediction.
2) give the paper to someone to hold, and not to show now
3) take out the cards from svengalli from box, and rifle shoufle few times,until spectator is satisfied. and place deck back in box.
4) give the deck to the persone infront of you, asking him to under the table, to open the box, to place the box on the table, and to do few CUTS, until satisfied.
5) once satisfied, aske the persone to take the top card, and to place it with out looking at face down on the table.
6) Aske him, to still keep the deck under the table, and to pick up the box from table, and under the table, to repace all cards in the box.
7) ask him to give the box under the table.

when you get the box, just switch it for the one on your knee, and bring that one out and leave it full view on the table.
THEN COME THE SURPRISE IF THERE IS A MAGICIEN AT THE TABLE
Exactly at the same time that you get the deck under the table, STAND UP
AND GO ON STANDING UP INFRONT OF THE TABLE.
The rest i guess you know
Ask for him to turn over the face down card on the table, and then ask the other persone, to show your prediction.
ENDING POINT
Ask then some one, to open the pack lying on the table, and to do a search.
to see that they are ONLY 51 cards and that one is missing.
EXTRA ENDING POINT
do all this with OUT SLEEVES (Jacket ) and because you just have STAND UP
AND HAS GO ON STANDING UP INFRONT OF THE TABLE.
WHERE IS THE SVENGALLI DECK GON ???
NO POCKETS, NO FAKE POCKETS, NO SLEEVING, NO EXTERNAL HELP,
"NO NOTHING"
actually you end up totally clean
But i cant tell you where the deck when to (svengalli), because then
I will be acuse of exposure. It just disapear,s and THATS MAGIC !!!
enjoy it (? you miss the end part, sory)
karl