Two years ago, not long after Patrizia Reggiani was released from prison, a camera crew from a trashy Italian TV show turned up unannounced at her Milan workplace. Reggiani had just spent 16 years inside after being convicted of arranging the murder, in March 1995, of her ex-husband Maurizio Gucci, the last of the Gucci family dynasty to run the luxury brand. The former socialite had always...