Murder on the High Seas: Classic Mystery Movie

A woman wins a lawsuit against an older married man. It threatens his very lifestyle and his family. His son soon finds out that the woman is in fact part of a much larger gang of blackmailers and she's about to flee the country.

He follows with his chauffeur as they embark on an ocean liner. They pretend to be wealthy playboys to entice the woman but things don't go as planned...