To clear her father 's name , Quentin 's daughter Pat ( Patricia Roc ) , and her boyfriend Captain Mellish ( Derrick De Marney ) , search for the real murderer .
When Zaroff is discovered dead from an excess of ether , Quentin is immediately suspected .
To clear Zaroff 's father 's name , Quentin 's daughter Pat ( Patricia Roc ) , and her boyfriend Captain Mellish ( Derrick De Marney ) , search for the real murderer .
When Zaroff is discovered dead from an excess of ether , Quentin is immediately suspected .