"I'll let Ned Newton do that. I want to stay here."
Tom telephoned to Ned to meet him at Mrs. Damon's house, and also to bring with him certain things from the laboratory. And when Ned arrived in an auto, with various bits of apparatus, Tom put in some busy hours.
Meanwhile Ned was sent to the drug store, to see if any clues could be obtained there as to who had sent the message. As Tom had feared, nothing could be learned. There were several automatic 'phones in the place, and they were used very often during the day by the public. The drug clerks took little or no notice of persons entering or leaving the booths, since the dropping of a coin in the slot was all that necessaary to be connected with central.
"Well, we've got to wait for the second call here," said Tom, who had been busy during Ned's absence. He had fitted to Mrs. Damon's telephone a recording wax phonograph cylinder, to get a record of the speaker's voice. And he had also put in an extension telephone, so that he could listen while Mrs. Damon talked to the unknown.
"There, I guess we're ready for them," said Tom, late that afternoon. But no queer call came in that day. It was the next morning,
