First let me state that this was a great episode. I have often been a wee critical of Elspeth Eric's work in Mystery Theater. She writes with a very familiar, whimsical style that depicts romances far more than mystery. In "The Mysterious Slumber" Eric hits a homerun. One of the reasons why she was such a success is that Eric herself played the female lead of Mary--and she did an amazing job. 4 stars.