I can make no sense of that." The sergeant kept turning it over in his big fingers.

"What's V.V.?
Somebody's initials, maybe.

What have you got there, Dr.Wood ?" It was a good-sized hammer which had been lying on the rug in front of the fireplace--a substantial, workmanlike hammer.

Cecil Barker pointed to a box of brass-headed nails upon the mantelpiece.
"Mr.Douglas was altering the pictures yesterday," he said.

"I saw him myself, standing upon that chair and fixing the big picture above it.
That accounts for the hammer." "We'd best put it back on the rug where we found it," said the sergeant, scratching his puzzled head in his perplexity.