Tonight at 9 p.m., PBS' award-winning Frontline series presents a documentary, Inside the Meltdown, that sorts through the rubble of Wall Street to detail how last year's economic catastrophe happened. The show's emphasis is on how former Treasury Secretary Henry Paulson and Federal Reserve head Ben Bernanke found out the depth of the mess and raced the clock trying to figure out what to do. Thankfully, the explanations are in plain English rather than financialese. It seems strange that the show has received almost no advance publicity here in Banking Town USA. Inside the Meltdown will be shown at 9 p.m. on UNC-TV in Concord (Channel 58, Time Warner Cable 13), and South Carolina ETV in Rock Hill (Channel 30, Cable 15). Charlotte's WTVI, of course, will broadcast Antiques Roadshow instead.