and rushed into the room without ceremony.
"Dad, we've found a clue!" cried Joe, when he saw his father sitting at the huge oak desk. Then he fell back, embarrassed, when he saw that there was some one else in the room.
"Beg pardon!" said Frank, and the boys would have retreated, but Mr. Hardy's visitor turned around and they saw that it was Perry Robinson.
"It's only me," said Slim. "Don't go."
"Perry has been trying to shed a little more light on the Tower robbery," explained Mr. Hardy. "But what is this clue you are talking of?"
"It isn't about the robbery," replied Frank. "Although it might have something to do with it, for all we know. It's about the red-headed man who stole Chet's car and who tried to hold up the steamboat ticket office."
"What about him?"
"This!" said Frank, taking the fragment of red hair from his pocket and showing it to his father. "The fellow wore a wig."
Mr. Hardy examined the little tuft of hair closely.
"Where did you find it?" he asked.
"In the wreckage of that smashed car."
Mr. Hardy nodded.
"That seems to link up a pretty good chain of evidence. The man who passed you on the
