“Frank Roscoe’s Secret” was the title of the third volume. There always seemed to be a mystery about Frank Roscoe, and his chums could never penetrate it. At times he was moody and distraught, and he seemed to have some secret that worried him. He made no confidant of any one and succeeded in avoiding all inquiries.
The four lads went camping, and it was hoped that Frank would forget his troubles, but, instead, he seemed to get right into the thick of them. Frank, for some years, had believed his father dead, but it transpired that he was not. Mr. Roscoe was kept in a private insane asylum, though he had full possession of his reason, only he was made ill by drugs constantly administered to him by men who had an interest in keeping him out of the way. How he was rescued, and the perils the boys ran in saving him after they had released him from the institution, you will find set down in the third book.
In the fourth book, called “Fenn Masterson’s Discovery,” there was related the details of a long trip the chums took on the Great Lakes. They were aboard a vessel commanded by Captain Wiggs, and almost from the start the boys were involved in a mystery. They were pursued by strange men, when they landed to witness a large grain elevator on fire, and eventually they succeeded in causing the breaking up of a gang of Chinese smugglers, and a band of scoundrels who were secretly taking valuable minerals from a cave, under land owned by a man whom the boys had once befriended. It was not until after some strenuous happenings that these events had come to pass, and, more than once, our friends were in danger. But Fenn Masterson succeeded in getting on the trail of the mystery, through an odd discovery he had made, and, though he was captured by the enemy, he used his eyes and ears to good advantage, so that when his friends came he could lead them to the secret cave.
Following the exciting events of their cruise on the Great Lakes, the boys had returned to Darewell, and had resumed their studies at the High School, where they were great favorites with the other pupils. At the time this story opens the fall term was well under way, and football was the chief sport, our heroes playing on the first team of the school.
The reason for the midnight visit of Bart, Frank and Ned to the school was this: Stumpy, the missing member of the quartette, was an odd sort of lad, always making collections of one thing or another. Sometimes it was postage stamps, or postmarks, and again minerals, or jackknives, or butterflies.
The day of the midnight visit, when the Darewell Chums, together with Bart’s sister Alice (who wanted to be a trained nurse) and her chum, Jennie Smith, were in a drug store getting soda and cream, Fenn had pulled from his pocket, together with his handkerchief, a small mud turtle. There had been a wild scramble on the part of the girls, and some ladies in the store, before Fenn recaptured the reptile.
“What’s that for?” Bart had asked.
“Oh, nothing,” Fenn had answered, as casually as possible.
“It certainly is something,” Ned had insisted, and they had badgered Fenn until he finally admitted that he was now collecting mud turtles, and had a number of them in a pen at home.