In the mid-1960s, Richard Todd starred in two British films based on Edgar Wallace's . was the sequel to Todd's earlier . Playing insurance investigator Harry Sanders, Todd comes upon an insidious scheme to steal the valuables from the sunken ships insured by Sanders' firm. The mastermind behind the plan is one A. J. Magnus, played by the usually heroic Dale Robertson. Since we know from the get-go that Sanders will be triumphant, suspense is minimal in