A man drinks from a glass left on the table, then suddenly collapses. The glass is untouched by others, no poison is detected. What caused the collapse?
Category: Mystery · Difficulty: expert
Hint: Consider substances invisible but harmful in small amounts.
Answer
Glass held lethal allergen residue
Explanation
Residue of a deadly allergen on the glass caused anaphylactic shock upon drinking without visible poison.
This is a expert mystery riddle — one of the harder riddles here. The answer is Glass held lethal allergen residue.
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