Too much detailing the minutiae of high-tech surveillance equipment, describing every action in setting it up, step-by-step motions in card tricks, etc.
The main premise (the protag's end game) is unrealistic and doesn't jibe with her moral character, even though she's uninteresting and unsympathetic. Also, there are no likable characters in the book. And the whole thing is all very predictable.
Was this the first novel Connelly wrote, then shelved for years, then his agent said "Hey, let's publish that thing."? Sure seems like it.