An hour later Fenn and Ned came in.
"Did you get here all right?" asked Ned, eagerly, but a sight of Frank's sad face sobered him. The two boys were told what had happened.
"I don't know what to do," Bart admitted as he and his two chums went outside, leaving Frank with his father.
"I've got an idea!" exclaimed Fenn eagerly. "I saw by that paper which Frank dropped, that Dr. Robertson was spending a few days at Forest Villa. That's the next place to Mr. Armstrong's house."
"Who is Dr. Robertson?" asked Ned.
"Why he's a great specialist on diseases of the brain. Why not go to him, and ask him to come and see Frank's father? I'm sure he would if we told him all the facts."
"Say!" cried Bart. "That's a fine idea! Hurry off and see if the doctor will come. If he wants pay we can give it to him."
But Dr. Robertson did not want any fee, when Fenn had breathlessly explained the circumstances to him. He questioned the boy closely, and then, taking his medicine case with him, set out through the woods. He was on his vacation, he explained, but he never missed a chance to study or treat a brain disease, and he was very much interested in Mr. Roscoe's case.
Dr. Robertson sent all the boys out of the tent, and told them to stay away while he examined the patient. How anxiously they waited for the verdict, Frank most of all! Was the case a hopeless one? At last the doctor came out. He was smiling, and the boys took that as a good sign.
"You can come in, boys," he said.