"A CPA brought down Al Capone. There's a reason they want you to testify."
— Sam Axe, Burn Notice, "False Flag"
He was the Watch's secret weapon. There wasn't a bookkeeper in the city who would like to see a visit from A. E. Pessimal unless, of course, he was perfectly innocent — although generally that could be ruled out because Mr and Mrs Pessimal's little boy could track an error all the way through the ledger and down into the cellar where the real books had been hidden.
You follow drugs and you find drug addicts and drug dealers. You follow the money and you don't know where the fuck it's gonna take you.
Det. Lester Freamon, The Wire, several episodes