Fog

This complicated murder mystery is set aboard a fog-bound ocean liner. Eccentric millionaire Alonzo Holt (Robert McQuarrie) is the first victim, knocked off for his vast fortune. Two more murders occur before phony medium Madame Alva (Helen Freeman) offers to help solve the mystery. Alas, the guilty party is very close to Madame Alva, and doesn't intend to have her spill the beans. (allmovie.com)