Thomas Baxter's book covers the methods and history of this much sought after effect, 'A Card Merely Thought Of''.  It has to be one of the strongest effects in magic, a piece of pure mind reading, the spectator doesn't take choose a card, doesn't look at a card, they merely think of a card - it's the magician's job to find that card.  You have the author's own methods and discoveries along with his work on the history of this effect.