Writing
German Julius Reuter sends 19th-century news by carrier pigeon and then by wire, founding a news agency.
A girl saves her fiancé's stabiliser plans from spies.
The murders are committed in swift succession on board a liner crossing the Atlantic in a dense fog, and many of the passengers come under suspicion before the actual killer is bought to justice with the aid of a very substantial "ghost."
In 1915 during the First World War, a British secret agent is killed while stealing secret Turkish plans for the Gallipoli Campaign but manages to pass his information to an American journalist.