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It has been noted that the Librarian has a happy knack for uniting a searcher after knowledge with exactly the right book they need at just the right time.

Such a book delivered in a timely manner to Windle Poons was Stripfettle's Believe-It-Or-Not Grimoire.

This contained the awful warning about the fate that befell the city of Kahn-Li, when a plague of little carts happened, which at first the population did not recognize as a plague because they were so incredibly useful. However, the carts had another purpose in mind, or rather in the mind of the entity directing them...

Armed with this knowledge, Windle and the Fresh Start Club then assist the Faculty in saving the city....

Kahn-Li, written as Khanli, is a country or region marked on The Discworld Mapp.

Stripfettle's Believe-It-Or-Not Grimoire is an obvious parody of Roundworld's Ripley's Believe It or Not! publications.