Serendipity. Tomorrow Trisha Posner and I are off to Tampa to tape an interview with a British documentary crew filming a series of 12 controversial historical cases for Channel 5 in the UK. One of the shows is the enduring mystery around the death of Italian banker Roberto Calvi, found hanging under London's Blackfriars Bridge in 1982, and forever immortalized in Godfather III. Calvi's hanging corpse opens God's Bankers. Now, just a few days ago, the Italian prosecutors have finally thrown in the towel. The 33-year investigation into who killed the man then nicknamed 'God's Banker' is at last being closed.