The Valley of Fear
What was unbelievable for Watson when he said that there was no stain on the hammer?
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From the text:
“Well, I first had the hammer examined. There was Dr. Wood there to help me. We found no signs of violence upon it. I was hoping that if Mr. Douglas defended himself with the hammer, he might have left his mark upon the murderer before he dropped it on the mat. But there was no stain.”
The Valley of Fear