A Case of Red Herrings is a book by Critical Thinking Press. It is full of short mysteries with clues to find out the longer untold stories. Listeners figure them out by asking questions that may be answered with a yes or no. Confused yet? Marina was. It took a lot of directing to get her to start asking a question other than "What should I ask?" In her defense, I was never good at this type of logic puzzle either. I prefer Sudoku and Kakuro. They are much more straightforward.
For those of you who want to try it, here is the full puzzle story I used in the comic strip:
Tana announced to her colleagues that she had created something that has no beginning, no end, and nothing in the middle. If they would stop by in the morning, she would share the formula for her creation with them. They did and she did. What did she create?
If you want, feel free to ask a question. I'll answer them in my comments section. No prize for the winner except the satisfaction of winning!