Sophie and her father are sailing their yacht Salsa in a race on Sydney Harbour. Before the race starts, Sophie sees Zenith, a big luxury yacht. On board Zenith are American billionaire Conrad Rossiter and his son Ryan, who are visiting Sydney. As Salsa and the other boats race around the harbour, Sophie sees something strange happening on Zenith – Ryan Rossiter is in danger. Sophie knows she has to help, but that’s going to take some quick thinking and clever sailing.