Chapter 17 SONIA'S ESCAPE

"One of M. Formery's innocents," said Guerchard, turning to the Duke.

"The chalk?" said the Duke. "Is it the same chalk?"

"It's blue," said Guerchard, holding it out. "The same as that of the signatures on the walls. Add that fact to the woman's sudden realization of what she was doing, and you'll see that they were written with it."

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