Fear Is the Key

Following the death of his family in an aeroplane crash, a man plots an elaborate revenge on those responsible. He plans to get close to a tycoon who has been approached by the culprits to help them retrieve the cargo of the lost plane... John Talbot is an underwater salvage expert who witnesses the murder of his wife and child. After working with the police, Talbot hatches his own scheme to bring the killers to justice. Posing as a criminal, he stages the phony murder of a police officer and kidnaps Sarah Ruthven, the heiress to a petroleum fortune. Talbot's false daring attracts the attention of a criminal mastermind who wants to recover the valuables aboard a plane that recently crash-landed in the water. However, Talbot knows that the same man was responsible for his family's death, and he intends to see that he never returns from their exploratory search of the wrecked plane. (official distributor synopsis)