...the book is not quite what I expected, for a number of reasons. The author’s starting point is interesting. He suggests that Poe’s “The Murders in the Rue Morgue” set a pattern for detective fiction with an emphasis on “enclosures, death and references to sequestered lives”. So although there is quite a bit of focus on Golden Age fiction, when – most people would accept, I think – the locked room mystery was in its hey-day, the book includes extensive discussion of some stories that one wouldn’t really associate with the locked room sub-genre. A key example is that splendid Charles Dickens story, “The Signalman”.Unfortunately, like all academic tomes it's a pricey book and will run you well over $50 (plus shipping depending on where you find it). To purchase a copy of the book try the usual bookselling sites. I found it listed at amazon.com and bookdepository.com (free shipping always!). It may be at other sites as well.
For more on the book see Martin's post Narratives of Enclosure at his blog.