Lee Gruenfeld was a computer scientist before he began writing sharp, successful legal thrillers like his previous All Fall Down, and it is clear that both sides of his brain were at work for The Expert. Next time you watch a so-called "expert witness" spouting scientific gospel on the stand, consider the dilemma faced by defence whizz Rebecca Verona, whose expert witness in the case of a computer executive charged with treason seems to be working for the other side. Even if you don't know a computer chip from a potato chip, you'll appreciate the intelligence and excitement of Gruenfeld's story.