"What do you see?" asked the secret agent.
"A pale green circle," answered the other, "and it is crowded with irregularly shaped spots."
"Compare the circle with the dial of a watch and look closely at the point where the six should be."
"Yes," said Fuller.
"What do you see—at a very little distance from the edge?"
"There are some small blue spots; some are dark, the others lighter and more intense."
"That last is my proof," said Ashton-Kirk. Then as Fuller turned upon him a still inquiring look, he added:
"The indications have been that some member of Dr. Morse's household had a hand in his death. The house was secure at all points; it was not possible for any one to gain an entrance after the locking up. You might say: Suppose the criminal had entered the house before the time for locking up and remained concealed until he saw his opportunity? To that I would answer that we would have detected his method of departure. He should have left something unfastened behind him unless he had a confederate in the house. That the doors and windows, in every instance, were fast proves that this must be the case."
Fuller nodded his head.
"That's so," said he.