The Treasure House Of The Prussian King (The Search For The Kaiser' Secret Treasure House)
Adventure #6 in the collection . First published in Thomson's Weekly News 06/29/1918
With the previous "banker", the man who provides the actual funds for German spies in the UK, recently imprisoned, the job of the new banker is to find where the previous stash of money was hidden. Major Haynes wants to find it first.