I like these characters so much that my prejudices will show through. I thoroughly enjoy watching Benedict Cumberbatch and Martin Freeman in any setting, particularly when Sherlock is explaining something how he solved a case. With that in mind, I have to say that this particular episode was so full of twists and turns and the editing so convoluted, I had all I could do to keep up. Mary Marston (Mrs. Watson) found herself trying to cover up her making a pact with three others as a spy. She's in with dangerous company when one of them shows up. Sherlock gets into the act and the consequences are deadly. This sets up a real change in personality and direction for Sherlock. The next two episodes will hopefully validate this one.