The conventions of the Gothic novel give way to an exploration of duality and double consciousness. We can see this in both The Picture of Dorian Gray and in Robert Louis Stevenson's Strange Case of Dr. Jekyll and Mr. Hyde.
The Salvation Army Barracks in London served both as a place to house members of the Salvation Army and a place to serve the working poor and those in need in London. They provided services such as food, clothing, and a place to sleep and rest. Captain Lobe is stationed there in A City Girl before being deployed to unknown whereabouts.