"Sure. Well, I'm just going to have a look for that bat now. Maybe I'll have better luck than Mortimer did." "Go ahead. I'll stay here in case Ikey comes in with the socks. No use having him bother us. Might as well pay him so he'll quit running in." "Sure. Well, I'm going to rummage for the bat," and Andy, thinking of many things, went down the corridor to the large closet that was used as a store room by the students. It was more filled than before with many things, and Andy had some difficulty in locating the bat. Finally he found it away down in a corner, under an old football suit, and drew it out. As he did so something fell to the closet floor with a clang of metal. "I wonder what that was?" mused Andy. "It sounded like----" He did not finish the thought, but made his way to the far end of the closet. It was dark there, but, groping around, his fingers touched something hard, round, smooth and cold. With trembling hand Andy drew it out, and when the single electric light in the center of the storeroom fell upon it Andy uttered a cry of surprise. "Frank's silver cup!" he cried. "The thief hid it in there! I wonder if the book's here, too?" He made a hasty but unsuccessful search and then, with the bat and cup, he hurried to the room where Dunk awaited him. "What's up?" demanded Dunk, as Andy fairly burst into the room. "Lots! Look here!" "Frank Carr's silver cup! Where'd you get it?" "In the closet where Mortimer Gaffington hid it!" "Mortimer Gaffington?" gasped Dunk. "You mean----" "I mean that I'm sure now of what I've suspected for some time--that Mortimer is the quadrangle thief!" "You don't say so! How do you figure it out?" "Just think and you'll see it for yourself," went on Andy. "When we had the chase after the thief down this corridor that time, the trail seemed to lead right to this closet, didn't it?" "Sure," agreed Dunk. "And who did we find in there?" "Why, Mort, of course. But he said he was looking for Charley Taylor's bat." "Well, he may have been, but that was only an excuse. Mortimer didn't want that bat, but he was almost caught and he did want a place to hide the stuff. The book he could slip in his pocket, but he couldn't do that with the cup. So he threw it back in a corner, and it's been there ever since. Probably he was afraid to come for it." "Andy, I believe you're right!" cried Dunk. "But one thing more--did you find a pair of rubber shoes? You know Frank said the fellow that went out of his room in such a hurry wore rubber shoes." "I forgot about that. I'll have another look." "I'll go with you. Ikey was here and I paid him for your socks and mine. So we can lock up." "And be sure you do lock," warned Andy. "I don't want to lose any more stuff. Say, Mortimer must have my sleeve links, all right." "All wrong, you mean. And my watch, too! I wonder if we're on the verge of a discovery?" "It looks so," said Andy, grimly.