As I said in a recent thread,
Bob Cassidy's Fundamentals.
Paul Brook's Alchemical Tools.
Then Corinda's 13 Steps.
These will teach you foundation skills in contemporary mentalism.
13 Steps is like an encyclopedia. It's got tons of information, but learning mentalism from it would be like learning English by reading the dictionary. Fundamental's covers how to perform mentalism, and also has a nice long list of books in the back to read, which he calls The 39 Steps.
Derren Brown and, in all likelihood, Lior Suchard both started from the same basic sources. They're using contemporary classic methods done very well, for the most part. There's probably the occasional fancy device in play but generally speaking well placed peeks, switches, forces, and a decent memory are the bulk of what's at play.
The thing about mentalism is that it is far more demanding theatrically. The reason guys like Lior and Derren are so good at it is because they understand the theatrics behind it, which makes what they do seem so much more impossible. However, I assure you, there's nothing they're doing that can't be learned from sources currently on the market.