PM Card Mark System by Pete McCabe

Pete McCabe captured the imaginations of magicians everywhere with his stellar book, Scripting Magic.
Now he’s back with a seamless, practical way to turn the deck in your hands right now into a marked deck; you only need a Sharpie marker. He spent a dozen years perfecting his marking system, and he teaches it all—along with several of the most deceptive marked-deck magic we’ve ever encountered—in this exciting new ebook.

The PM Card Mark System is the only marked deck system that:

You can make with your own deck, using just a Sharpie
In which the markings are actual numbers and letters (a la Ted Lesley), so there are no weird codes or symbols to memorize
Each card can be “read” from a spread in the hands
The detailed descriptions and diagrams aren’t just easy-to-follow, they’re addictive. McCabe (a professional Los Angeles-based writer) has an enthusiasm for this material that is contagious. It makes you want to mark the deck as you read. And you should: “Simple Miracle 1” and “Perfect Prediction” are insanely good.