After the book and movie you will probably be reaching for more on Inbau, Ried, and Buckley and their nine step method and looking for your own cute little Neither terrier.
Trailer - - and remember, earning 30% can sometimes be a very dangerous activity. Also, the book's protagonist sums it up pretty well in the end - - "I'm a headhunter. It's not particularly difficult. But I am king of the heap."