HALF an hour later the stone, reposing in a tin box of cigarettes, was in the mails on the way to Trent’s camp at Kennebago. Mrs. Kinney had instructions to hold all mail and its safety was thus assured. There was nothing more to fear. He wanted very much to know what had happened at Miss Thompson’s apartment and proposed to call after breakfast.

But Devlin called first upon him. It was a depressed Devlin. Not indeed a Devlin come to be apologetic, but one less assured.

“Well?” said Trent affably, “come to search me again. I’m getting a little tired of it, my good man.”

“I want to know why you pass here under the name of Maltby of Chicago when your name is Trent and you live in New York City.”

“A private detective has no right to demand any such knowledge. Last night you took upon yourself powers and authority which we could have resisted if we chose. You had no legal right to search us. I submitted first because I had nothing to fear and secondly to see if the others had the stone. I didn’t think they had.”

“What do you know about the stone?” Devlin demanded suspiciously.

“Everything except just where it is at this present moment. Between you and me, Devlin, I’m here after it too. I was at Groton, as can easily be proved, on the day after the murder.” Trent smiled as a curious look passed over the detective’s face, “I’m going to disappoint you. I passed the day and night in Boston when the murder was done. I have just as much use for that ten thousand dollars as you have. By the way I suppose you got the stone?”

“Like hell I did,” Devlin cried red in the face, “I got this.” He showed Trent the piece of cut glass which had hung in his room for so long. “Glass, that’s what it is.” Devlin leaned forward and looked hard into Anthony Trent’s eyes. “You know more about this than you pretend. It ain’t accident that brings you around when two such stones as Dangerfield’s ruby and this here emerald get stolen. There’s something more to it than that. There’s something mighty queer about you, Mister Anthony Trent, and I’m going to see what it is.”

Trent looked at him for a moment and then smiled. It was the tolerant smile of the superior. It angered Devlin. His red face grew redder still.

“My good Devlin,” said Trent, “stupidity such as yours may be a good armor but it is a poor diving suit.”