The Secret Weapon - 65 minutes - 1943. Sherlock Holmes must outsmart the Germans and get scientist Dr. Tobel out of Switzerland and back to England with his secret bombsight equipment. The wartime plot of this adventure finds Holmes and Watson once again doing battle with their villainous enemy, the evil Moriarity, who is working for the Nazis this time. Terror By Night - 57 minutes -1946. Sherlock Holmes has been hired to safeguard the valuable Star of Rhodesia diamond belonging to Lady Margaret Carstairs during her train journey from London to Scotland. Holmes and Dr. Watson not only have to foil an attempted robbery but also catch a murderer. Terror By Night, with its intricate plot, is arguably one of the most atmospheric and exciting films in the series.