Lorien, too tired for anything truly terrible, tells Katharine about a mysterious, anonymous, unsolvable set of puzzles.

Sources:

⁠https://en.wikipedia.org/wiki/Cicada_3301⁠⁠
https://en.wikipedia.org/wiki/Steganography⁠⁠
https://www.npr.org/2014/01/05/259959632/the-internets-cicada-a-mystery-without-an-answer⁠⁠
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http://www.telegraph.co.uk/technology/internet/10468112/The-internet-mystery-that-has-the-world-baffled.html⁠⁠
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http://mentalfloss.com/article/31932/chasing-cicada-exploring-darkest-corridors-internet⁠⁠
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