I've created a set of 2 minute mysteries for a colleague of mine. She has a student who's too smart for his grade level and is constantly looking for more challenging work. This was an idea we come up with. And the student loved it!!!
Each one based loosely on a detective from literature. This is based on Kerry Greenwood's Phryne Fisher. [Note: The content of the Phryne Fisher *book* series is more appropriate for ages 13+.]
These are great for sub activities, extra credit, learning to make inferences, and so many other things!