knapsack?â
âSutton,â the officer answered.
Frank nodded. âIt looks like a plant, Chief.â
âSure it is,â Joe declared. âAlf scared Sutton off when he attacked Frank. He probably planted the radio to get even.â
âThatâs right! Thatâs just what I told them!â Alf boomed. âThanks a lot for sticking by me, fellows. Iâll get Sutton!â
âHold on there!â commanded Chief Collig. âYouâll be back here for assault if you try that. Since the Hardys back up your story, Iâll let you go. But if Sutton prosecutes, weâll have to bring you in again.â
âOkay.â Alf wrung the boysâ hands, thanked them, and left.
Frank pointed to a radio on Colligâs desk and asked, âIs this the stolen property?â
âThatâs it,â Lieutenant Daley spoke up.
âTake a look,â the chief invited, and Frank picked up the compact, heavy little set.
âJapanese make. Yokohama Super-X.â
âLetâs see,â Joe requested. He gave a low whistle as his brother passed it to him. âWhat a little beauty! Brand new, too. Look at that nickel-and-ivory case!â
âItâs an expensive, rare set,â Lieutenant Daley commented. âNot many people can afford one.â
âThatâs true,â Frank said. âHank Sutton seems to be just a seedy-looking character who lives in Shantytown. But Joe and I have a hunch as to how he could afford a radio like this.â
âYou mean he stole it?â Chief Collig asked.
âWe think he belongs to a ring of thieves,â Frank told him. âIf they fight among themselves, it would explain the trouble in Shantytown.â
Lieutenant Daley looked doubtful. âIf Sutton stole the radio, why would he plant it on Alf? That would only call the attention of the police to himself.â
Frank grinned. âIf youâd seen Sutton go after me, youâd know he acts first and thinks later.â
âThen heâs probably regretting Lundborgâs arrest right now,â Lieutenant Daley returned.
âThatâs not all heâll regret,â Joe promised grimly, âif heâs had anything to do with Chet and Biffâs disappearance.â
âThat reminds me,â the chief said. âThe boysâ parents received postcards from Northport, too. Weâre looking for the bald, loud-voiced man you told me about, but that isnât much to go on.â
âNo,â Frank admitted, âbut weâre working on a new clue.â He told of the discovery of the Fizzle soda bottle and the purchase of a similar one by the bald-headed man in Northport. âThatâs why we think heâs connected with stealing the Sleuth as well as Chet and Biffâs disappearance.â
âThen,â Joe put in, âwe learned that the dock manager up there owns the Black Cat and rented it the day of the bank robbery to the bald fellow and Ben Starkâthe one we saw talking to Hank Sutton in Shantytown.â
Chief Collig looked at the boys keenly. âI see what youâre driving atâthat Sutton may be more than a petty thiefâhe and the other two might be involved in the robbery!â
As Lieutenant Daley stared at the Hardys in amazement, Frank replied, âYouâre right, Chief. But we have no solid evidence yet to back up our hunch. Joe and I will check stores in town tomorrow to see where the radio came from.â
âGood. Weâll do some checking of our own too. Thanks, Frank and Joe, for coming down.â
When the Hardys reached home, their house was dark. They let themselves in quietly, went to bed, and fell asleep at once.
Some time later Joe was awakened by a noise. He sat up, listening. It came again-a soft knocking.
âFrank!â he whispered, shaking his brother. âSomeoneâs at the front door.â
Instantly Frank was awake. The boys