Magic Tricks

This outstanding trick is even easier that I guessed from the ad video (I thought I detected a DPS which isn't actually there). My son, who is a stronger card magician than I am, is completely baffled by this trick. There are so many magical moves and procedures that fellow magicians will be watching for and which just aren't there! Ungimmicked, fairly shuffled, unmarked deck, no forces at all, 4 free choices (selection plus 3 helpers), no card switches, and yet the selection is found at the sum of the three helpers. The spectator can be handed the deck after the selection of the three helpers and do the counting themselves, the selection is really there at the predicted location. The method is simple, but brilliant. I was familiar with a similar principle, but completely failed to detect its operation here (as I think nearly everyone else will as well).
After performing this a few times and getting very good reactions, I think this is my new favorite impromptu trick.