e you getting at, Quest?" he demanded. "You are not going to
pretend that you can see from your room into this, are you?"

"If you'll hold the object where I told you," Quest replied, "I can see
it. I promise you that. There, that's right. Hold it steady. I've got the
focus of it now. Say, French, where did you say that was found?"

"Just outside the Professor's back gates," French grunted, "but you're not
kidding me--"

"It's a finger from the Professor's skeleton you've got there," Quest
interrupted.

"How the blazes did you guess that?" the Inspector demanded.

"I'm not kidding," Quest assured him. "I've got a phototelesme at work
here. I've seen the bone all right. French, this is interesting. I must
think it over."

Quest hung up the receiver and rang off. Then he turned towards his two
assistants.

"Another finger from the Professor's skeleton," he announced, "has been
found just outside his grounds. What do you suppose that means?"

"Craig," Lenora declared confidently.

"Craig on your life," Laura echoed. "Say, Mr. Quest, I've got an idea."

Quest nodded.

"Get right ahead with it."

"Didn't the butler at Mrs. Rheinholdt's say that Craig belonged to a
servants' club up town? I know the place well. Let me go and see if I
can't join and pick up a little information about the man. He must have a
night out sometimes. Let's find out what he does. How's that?"

"Capital!" Quest agreed. "Get along, Laura. And you, Lenora," he added,
"put on your hat. We'll take a ride towards Mayton Avenue."

2.

The exact spot where the bone of the missing skeleton was discovered, was
easily located. It was about twenty yards from a gate which led into the
back part of the Professor's grounds. The neighbourhood was dreary in the
extreme. There were half-finished houses, little piles of building
materials, heaps of stones, a watchman's shed, and all the dreary
paraphernalia of an abandoned building enterprise. Quest wasted very
little time before arriving at a decision.

"The discovery of the bone so near the Professor's house," he decided,
"cannot be coincidence only. We will waste no time out here, Lenora. We
will search the grounds. Come on."

They advanced towards the gate but found it locked. The wall was unusually
high as though to obscure a view of anything that lay on the other side.
Quest noticed with interest that, in places where it had shown signs of
crumbling away, it had been repaired. He contemplat