Four long short stories, all related to the Great War (WWI), with a good sprinkling of spies and treasonous activity.

1. "Open Sesame!" takes place in France and involves a concealed cave and a plot by saboteurs.
   
2. It Began With a Wedding starts out with young Mrs Holderness discovering that her husband had married her in order to be revenged on his former fiancee. She becomes involved in the work of drawing up plans for an important invention, and a spy tries to steal them.
   
3. Her Final Choice takes place in Rumania, when the Austrians were advancing into the country. A beautiful girl refuses to leave her place in the hospital when the invading soldiers were coming.
   
4. The Haunted Well is a story about how a young girl helps to save the situation when submarines threaten shipping off the coast of Devon.