Two of Largo's employees have been killed in his headquarters in New York. His friend, Charity, has been kidnapped in the middle of the Piazza San Marco. His only lead is a mysterious message: 'Beware of the Doge...'. As the bodies start piling up, Largo, aided by the beautiful Domenica, turns the Serenissima upside down to find the young woman and unravel the truth before it is too late. Balls, duels, boat chases, revenge...ah, Venice!