How to Perform the "serenade of the kings" card trick

This card trick is called Serenade of the Kings. Make two piles of four cards. The first pile contains all kings, and we set these face down (except for the leader king in front) on the table in a star shape. The other pile contains four black spot cards that help us do our magic. Burying the kings into the black spot cards, one by one, shows that they disappear into the pile with a little twist and shake. Now we place the kings and black cards in four different piles of two, but once we pick them up, all the kings are gone again. Where did they go?