Mood in Amontillado

Here is a great analysis of mood in "The Cask of Amontillado" that explains not only what it is but how Poe does it.  Mood is one of those things that people talk about when they talk about writing but they don't really know what they mean unless they are really into literature or majored in English or something.  If you think about it, it is really a kind of odd word.