Actors: Robert Powell, David Warner, Eric Porter, Karen Dotrice, John Mills. In keeping with the Boys' Own derring-do of the story (set in Edwardian London and the Scottish Highlands), the movie maintains a brisk pace that's interrupted only for tea or cocktails.
Great suspense-full 70s movie - very entertaining. Robert Powell, John Mills and Karen Dotrice are particularly engaging in their various roles. 4.5 stars!