An interesting and coherent mystery!
The Layout and presentation is clean and well-separated, while the writing is clear and informative, the character descriptions flow nicely into one another and the GM quickly gets a handle on the overall mystery. I like how you made clear the outcomes and set the stakes. The only thing I'd prefer is if the clues present in the text were highlighted distinctly so I can pick them out at a glance (but that is a personal preference), it doesn't make sense to pull them into a separate section completely, since that would break the flow, but highlighting them out would be useful. Great work on this!