A detective receives a letter that seems to fade away before he can read it. How does he decipher it?

Category: Mystery · Difficulty: expert

Hint: Consider how invisible messages can be revealed.

Answer

He employs a unique method to uncover the text.

Explanation

Invisible ink can be made visible under ultraviolet light, allowing the detective to read the message.

This is a expert mystery riddle — one of the harder riddles here. The answer is He employs a unique method to uncover the text..

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