A docu-drama on the mysterious world of the private investigator in Australia, as seen through investigators, their clients and their most intriguing cases. Warren Mallard is an insurance surveillor, whose staff of clandestine operatives often go underground for months at a time to secure evidence. Peter Royle has specialised in missing persons for the past 20 years, and is looking for a 15-year-old runaway. Les is an insurance surveillance expert who demonstrates some of his intriguing techniques. Michael Oliver is a debt collector, who always gets his money, and also specialises in bugging and de-bugging. And criminal lawyer Chris Murphy balances the picture by putting the case against private eyes.