The kids with whom I have used them have loved them, so I developed a large body of materials from the Lawrence Treat’s excellent series Crime and Puzzlement, which appears to be available, perhaps with dubious legality, all over the Internet as free PDF downloads.
Here is a complete lesson plan on the Crime and Puzzlement case “Extortion.” I generally begin this lesson, in order to settle students after a class change, with this Cultural Literacy worksheet on the idiom “Ships That Pass in the Night.” You will, of course, need the illustration of the crime scene and its accompanying questions from the book to investigate the crime. Finally, this typescript of the answer key will help you and your students, using the evidence, to definitively solve the crime.
If you find typos in these documents, I would appreciate a notification. And, as always, if you find this material useful in your practice, I would be grateful to hear what you think of it. I seek your peer review.