The young American Lynn Blake is the assistant to the famous photographer Arno Leonardi. She accompanys him to Venice for a photo shoot.  Suddenly her boss disappears under mysterious circumstances. Lynn meets a charming man, but he seems suspicious.  Did he have anything to do with the kidnapping?
Lynn is not satisfied with the Italian police work, so she searches for her boss herself - and soon finds herself in trouble. She finds clues in the glorious Venetian past and goes to a party during the famous Venetian carneval. There she runs into a billionaire, who could be an important witness - or the killer of Arno Leonardi ...