Venice is a city full of secrets. For hundreds of years it has been the scene of scandal, intrigue and murderous rivalries. And it remains so today.1548, Lorenzino de Medici, himself a murderer and a man few will miss, is assassinated by two hired killers.Today, Marmaduke Godolphin, British TV historian and a man even fewer will miss, is stabbed by a stiletto blade on the exact same spot, his body dropping into the canal.Can the story of the first murder explain the attack on