"Their grandchildren had reminded Will of the song about demon pox he had taught them- when they were much too young, Tessa had always thought- and that they had all memorized. They sang it all together and out of tune, scandalizing Sophie."

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Demon Pox, oh, Demon Pox Just how is it acquired? One must first go to the bad part of town Until one is very tired Demon Pox, oh, Demon Pox I had it all along- No, not the pox, you foolish blocks I meant this very song- For i was right, and you were wrong!

— Cassandra Clare