There is an old trick called the "Four Burglars". There is a new variation found in Howard Thurston's "300 Tricks You Can Do" that is entirely different in method, and it makes for a fun and simple card trick for you to learn and practice.
The Effect and Patter:
Three jacks are shown, representing three burglars. A king is also used to represent a detective, while the pack represents a house.
The story goes as follows:
"The three burglars decided to rob the house, so one went in the front door."
(A jack is placed on the bottom of the pack.)
"Another entered the back door."
(A jack goes on top.)
"The third went in a window."
(The third jack is pushed into the center of the pack.)
"The detective, seeing this, also went in the back door."
(The king is placed on top.)
"The burglars, hearing the detective, ran around in the house."
(Here the pack is cut three times.)
The pack is then fanned, and in the center of the pack are found the three burglars, each one guarded by two detectives. That is, in the center of the pack, seven cards are discovered clustered together in the following order: King, jack, king, jack, king, jack, king.
The Secret:
Before commencing the trick, secretly place the fourth jack between two kings at the bottom of the pack, and put one king on top of the pack. No one knows of this preparation.
When one jack "goes in the window," push it in the pack a bit above the center. Place the other cards as described. Then when you cut the cards, three jacks and four kings will be together as described. One cut is sufficient, but two additional cuts add to the effect.
Variations:
Feel free to come up with your own story to go along with the trick. Make it your own. Maybe it's a dog catcher trying to catch three lost dogs.
Remember:
Practice practice practice. Make sure you have your story rehearsed and the trick rehearsed to a level where you don't need to think too hard about either one. That way you can focus on your audience.
Also, make sure not to show the initial three jacks for too long, since the suit of one will be different at the end of the trick than it was at the beginning. You don't want your audience to notice this. Show them, but don't linger.
Only perform this trick once for any person. If they see it a second time they are much more likely to figure out how it's done. You want to leave them mystified.
Good luck!