“But this one isn’t bricked up,” said Fleming Stone. “It was originally intended to be enclosed; but it seems this fireplace is rarely used. Harris tells me that the late Mr. Van Norman used to talk about having the chute completed, and having a fire here more often. But the library wood fire was more attractive as a family gathering place, and this formal room was used only on state occasions. However, as you see,” and Mr. Stone raised the iron lid again, “this opens directly into the cellar, and, I repeat, formed the means of entrance for the murderer of Madeleine Van Norman.”

Fleming Stone’s voice and manner were far from triumphant or jubilant at his discovery. He seemed rather to state the fact with regret, but as if it must be told.

Mr. Fairbanks looked amazed and thoughtful, but Rob Fessenden was frankly incredulous.