“Jinks!” exclaimed Crane. “There he is naow with Roger. Where d’you s’pose they’re going?”

“The mystery is easily solved,” declared Piper at once. “My deduction of the case is as follows: Eliot has a sister; this sister is attacked by the vicious dogs of one Fletcher; Stone rushes to her defense; he beats off the said dogs and kills one of them; the before-mentioned Eliot takes his before-mentioned sister home; he relates to his folks how she was rescued from dire peril and a fearful fate by the before-mentioned Stone; at once her parents wish to see and thank the said Stone; Roger is dispatched post haste for the hero of the thrilling and deadly struggle; said hero is carried off in triumph to the palatial residence of the before-mentioned parents. I’ll stake my professional reputation on the correctness of the deduction.”

“Guess you’re right, Sleuth,” said Chub. “Roger thinks an awful lot of his sister, and he choked and couldn’t seem to find words to say when he tried to thank Stone.”

“Say,” drawled Crane, “perhaps this Stone ain’t such an awful bad feller after all. Jack Walker tol’ me he pitched into Hunk Rollins hammer an’ tongs ’cause Hunk was plaguing Jimmy Jones, and he said he was a-going to tell the professor the whole business. Bern Hayden is pretty top-lofty, and he’s down on Stone for somethin’, so he wants to drive Stone outer the school. I tell you fellers right here that I hope, by Jinks! that Stone don’t go.”

“’Sh!” hissed Sleuth mysteriously, glancing all around, as if fearful of being overheard. “Draw back from this bright glare of light, where we may be spied upon by watchful and suspicious eyes.”

When they had followed him into the shadow at the corner of the building and he had peered and listened some moments, he drew them close together and, in a low, hoarse voice, declared:

“It is perfectly apparent to my trained observation that there is more in this case than appears on the surface. I have struck a scent, which I am working up. I pledge you both to secrecy; betray me at your peril. Between Hayden and Stone there is a deadly and terrible feud. Sometime in the dark and hidden past a great wrong was committed. I feel it my duty to solve the problem and right the wrong. I shall know neither rest nor sleep until my task is accomplished and justice is done.”

“Well,” said Sile, in his quaint, drawling way, “you may git allfired tired an’ sleepy, Sleuth; but I agree with Chub in thinkin’ it pritty likely Roger is a-takin’ Stone up to his haouse.”

The boys were right in this conviction, although Ben did not suspect whither he was being carried until they were passing the Methodist church and approaching Roger’s home.

“I am taking you to dinner,” said Roger, in answer to Ben’s questioning. “Mother asked me to bring you in order that she may thank you for your brave defense of Amy against old Fletcher’s dogs; and father wishes to see you, too.”