Whick book?

[s13zeTheDay]

Expert Card Technique is a great one. If you do not have it yet, stop all other trains of thought and buy/download Expert at the Card Table (can be gotten at many places online for free as online download). DO NOT buy By Forces Unseen unless you want to feel insignificant. After a month with the book I only managed to make one routine and half of another presentable, though I did learn one of my new favorite controls, the convincing control (I now use it all the time). Finally, I recommend The Card Magic of Le Paul for sleights, and Effective Card Magic if you are into gambling (it has a great section on the second deal, but that's pretty much the only above-average thing in it).

Also Paper Engine is good too. Check out my review of it in the reviews section.