A young scientist from Harvard, Claire Donovan, comes to a conference in Venice to clarify one of the most mysterious moments in the history of this city. It is known that Alessandra Rossetti, the famous courtesan of the 17th century, wrote a secret letter in which she warned the Venetian Council of the existence of a Spanish conspiracy against the Republic. Claire considers Alessandra a heroine, but an arrogant Cambridge professor, Andrew Kent, smashes her theory to smithereens, proving that the courtesan was among the conspirators...