“Why, here’s the diamond pendant!” exclaimed Henrietta.

And sure enough, in a small drawer in the dresser was the very jewel case Mrs. Webb had last seen in her son’s hands the night before his mysterious disappearance.

“Impossible!” Coe cried. But it was, beyond all shadow of a doubt. The four magnificent stones, hung one below another, of perfectly graduated sizes, sparkled and scintillated as Henrietta let it dangle from her finger.

“I don’t understand,” said Mrs. Webb, utterly bewildered.

“Who could!” exclaimed Coe. “I’m all at sea. Tell me more about those St. Johns. What sort of people can they be?”

“Oh, they aren’t thieves,—they can’t be!” Miss Webb stared, wide-eyed, at the gems. “And yet, how else explain all this? Tell me, Mr. Coe, why did they take Kimball away?”

“It looks to me as if whoever took him, did it to get the diamonds, at least partly for that.”

“But the St. Johns are wealthy; they could buy these stones and never miss the money.”

“Well, let’s look further. Suppose somebody utilized this empty house of the St. Johns to—”

“Oh, they don’t own the house,” Mrs. Webb interrupted, “they rent it.”