Can someone tell me where the dramatic irony,situational irony,ambiguity,characterization,major plotpoints are?

www.classicshorts.com/stories/lamb.html
The room was warm and clean, the curtains drawn, the two table lamps alight-hers and the one by the empty chair opposite. On the sideboard behind her, two tall glasses, soda water, whiskey. Fresh ice cubes in the Thermos bucket.
Mary Maloney was waiting for her husband to come him from work.
Now and again she [...] http://bit.ly/avxaJQ