highly esteemed on ac. count of their range and effectiveness of fire. Their thick walls, long bores, and heavy powder charges made them the most deadly of field-pieces.â â
âAnd Bowden is telling us he wants to mount a fieldpiece on a pirate ship!â Frank muttered,
Joe shrugged. âThatâs what heâs telling us. I wonder what he really wants the cannon for.â
Half a mile farther down the highway, Frank pulled up in front of the Garden Gate Motel. The clerk told them Bowden was in Room 15.
âThere it is!â Joe said, spotting the number. He knocked on the door. There was no answer.
âHey, this looks like a note,â Frank said, eying a paper pinned below the doorknob.
âMaybe itâs for us,â Joe suggested.
Frank read the message aloud: â âBowden! Clear out before itâs too late!â â
âWow! I Our friend has an enemy!â Joe remarked. âDo you think this will drive him away?â
Frank shook his head. âI doubt it. He wants that cannon too badly. Well, letâs go to Delmore and stop here on our way back.â
The detour they had to make took the boys past the farm of their friend Chet Morton. Chet was eighteen, roly-poly, good-natured, and loved to eat. Solving mysteries with the Hardys always gave him the jitters. Despite this, he was a loyal assistant and on more than one occasion had rescued them from dangerous predicaments.
âLetâs stop a minute,â Joe suggested, seeing Chetâs sister Iola near the swimming pool.
Frank grinned knowingly. Joe and Iola dated frequently. He pulled into the driveway. The boys got out and walked toward the pretty dark-haired girl.
âHi! she said.
âHello, there,â Joe said. âWhereâs Chet?â
Iola pointed to the pool. Their stout friend was underwater, wearing flippers and a snorkel. He traveled slowly, the snorkel moving like the periscope of a miniature submarine.
âAhoy!â Joe yelled as they ran to the waterâs edge.
Chet continued moving about like a walrus. But finally he emerged and removed the face mask and flippers.
âHi, fellows!â he called. âIâm having a hard time learning this. Canât get down deep enough.â
âWhatâs the trouble?â Joe asked. âThat extra fat you carry around make you too buoyant?â
âNow, listen here,â said Chet, âjust because I know good food when I see itââ
Then he changed the subject, telling them he was going to take lessons in skin diving from the same man who had taught the Hardys.
âSwell,â said Joe.
âI canât start, though, until I earn enough money to buy all the gear.â
âDonât let that worry you,â Frank spoke up. âIâll lend you my outfit.â
âThanks. And now bring me up to date on everything thatâs happened lately.â
The Hardys had just finished telling Chet and Iola about Bowden, the mysterious cyclist, and the skin-diving attack, when they saw a car driving in. At the wheel sat Callie Shaw, an attractive girl with blond hair and sparkling brown eyes. She was Iolaâs friend and Frankâs regular date.
Callie alighted, and after greeting everyone, said, âIâm glad youâre all here. I wanted to talk over plans for our Fourth-of-July beach party. Tony Prito is coming with us too.â
Tony, a schoolmate and fellow athlete at Bayport High, had been through many adventures with the Hardys.
âLetâs have a clambake like last year,â Chet suggested.
Suddenly Frank grabbed Joeâs arm. âLook over there! A manâs spying on us!â
He had seen someone peering from behind a tree near the road. The quick glimpse of a black jacket led Frank to believe that the man might be the wanted motorcyclist!
âCome on, Joe!â he whispered, starting to run.
Instantly the man raced off. Having the advantage of a