The private investigator sits in his car puffing a cigarette. Smoke billows from the dark window as he watches grainy images flickering through the camcorder screen. He's onto his third coffee but he can't let sleep get the better of him. He's trailing someone and a lost minute could mean he'll miss what he's spent the last 10 hours waiting for. It's dirty work, these "domestic" assignments, stuck in a car for hours never sure if you'll find something. But he's not complaining, the pay is good. It's true, not every divorce involves gruff private investigators stuffed with wads of cash for eyeballing wandering hearts. But when marriage breaks down, the involvement of hired hands is common. Accountants, lawyers, divorce coaches, psychotherapists and appraisers are among those who profit from the divorce industry.