He found the picture on his desk at Police Headquarters. Greig had preceded him by two hours to the building in Mulberry street, and was deep in the intricacies of the case when Britz summoned him. He entered the room, followed a moment or two later, by Manning.
"What do you make of it?" asked Britz, holding up the picture.
"Pretty jagged wound," commented Manning.
Britz produced a magnifying glass through which the three men examined the wound more critically.
"There are two perforations of the skin where the bullet entered," Britz pointed out. "Undoubtedly they were made by the needle which I picked off the floor of Whitmore's office."
"Well, what of that?" asked the chief.
"It confirms my belief that I have solved the mystery of how Whitmore was killed."
"I don't see it," snapped the chief. "If you do, why don't you enlighten us?"
"Because I can't be positive until I have more evidence," answered Britz, unmoved by the other's irritation. "However, I believe that before many days we shall have solved the entire case."
The conversation was interrupted at this juncture by the telephone bell. Britz lifted the receiver to his ear, made several replies in monosyllables, then returned the receiver to the hook.