"The murderer must have left it behind him." "V.V .-- 341.

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.