Frank and Joe find themselves on an uninhabited Caribbean island when they follow clues left by a gang of platinum thieves

Falsely accused of a robbery at the airport, the Hardy boys turn the tables on the real thieves by nabbing them in the act of committing another robbery.

Falsely accused of a robbery at the airport, the Hardy boys turn the tables on the real thieves by nabbing them in the act of committing another robbery.

"The Mystery of Cabin Island" by Franklin W. Dixon is an enthralling tale that follows the daring adventures of the Hardy Boys, Frank and Joe, as they investigate a puzzling mystery on Cabin Island. The story begins when the Hardy Boys receive an urgent message from their friend, Chet Morton. Chet's family owns a cabin on Cabin Island, a secluded and mysterious place in the wilderness. Chet informs the brothers that their cabin has been ransacked, and valuable belongings have been stolen. Intrigued by the mystery, Frank and Joe set off to help their friend and uncover the truth behind the break-in. As the Hardy Boys arrive on the island, they encounter an eerie and foreboding atmosphere. The island's dense forests and secluded location add to the sense of mystery and danger surrounding the case. The brothers quickly discover that Chet's family is not the only one facing strange occurrences on Cabin Island. A series of unexplained events, including disappearing boats and ghostly sightings, deepen the intrigue and compel the Hardy Boys to dig deeper into the mystery. Throughout their investigation, the Hardy Boys encounter a colorful cast of characters, each with their secrets and motives. As they follow the trail of clues, they find themselves in perilous situations, facing unexpected dangers and obstacles. The boys' resourcefulness, intelligence, and unwavering determination lead them to uncover a hidden treasure on Cabin Island, which is at the heart of the mystery. However, their discovery also puts them in the crosshairs of dangerous criminals determined to claim the treasure for themselves. As the plot thickens, the Hardy Boys must rely on their wits and teamwork to outsmart the criminals and bring them to justice. Along the way, they learn the importance of loyalty, courage, and the value of friendship. "The Mystery of Cabin Island" is a thrilling and suspenseful mystery that captivates readers with its clever plot twists, thrilling action sequences, and intriguing characters. Franklin W. Dixon skillfully crafts a tale that keeps readers on the edge of their seats until the final reveal. The story not only showcases the Hardy Boys' detective skills but also emphasizes the importance of integrity, perseverance, and resourcefulness in the face of adversity. As the brothers unravel the mystery, they demonstrate the true spirit of amateur detectives and leave readers eagerly anticipating their next thrilling adventure."

Valuable electronic parts containing platinum are being stolen from shipments made by Stanwide Mining Equipment’s cargo planes, and Frank and Joe are called upon to assist their world-renowned detective father solve the baffling case. While posing as Stanwide employees, the boys look into the truth behind the chief pilot’s death at sea. The puzzling trail of clues leads the young sleuths to an uninhabited Caribbean island, but the final, and most startling, discovery is made in the boys’ home town of Bayport.

"It certainly is a mystery how those autos disappeared," said Frank Hardy. "I'll say it is," replied his brother Joe, raising his voice to be heard above the clatter of their motorcycles. "Just think of it! Two cars last week, two the week before, and one the week before that. Some thieving, I'll tell the world." "And Martin's car was brand new," called back Chet Morton. "Mighty tough," Frank affirmed. "It's bad enough to lose a car, but to have it stolen the day after you've bought it is a little too much." "Must be a regular gang of car thieves at work." The three boys, on their motorcycles, were speeding along the Shore Road that skirted Barmet Bay, just out of Bayport, on a sunny Saturday afternoon. "A person takes a big risk leaving a car parked along this road," said Chet. "Every one of the five autos disappeared along the shore." "What beats me," declared Frank, turning out to avoid a mud puddle, "is how the thieves got away with them. None of them were seen coming into Bayport and there was no trace of them at the other end of the Shore Road, either. Seems as if they just vanished into the thin air." Chet slowed down so that the trio were riding abreast. "If the cars were only ordinary flivvers it wouldn't be so bad. But they were all expensive, high-powered hacks. Martin's car would be spotted anywhere, and so would the others. It's funny that no one saw them." "Some of these auto thieves are mighty smart," opined Joe. "They certainly have their nerve, working this road for three weeks, and with everybody on the lookout for them. It has certainly put a crimp in the bathing and fishing along the Shore Road." He gestured toward the beach below. "Why, usually on a Saturday afternoon like this you'll see a dozen cars parked along here. What with boating and fishing and swimming, lots of people used to come out from town. Now, if they come at all, they walk." "And you can't blame 'em. Who wants to lose a high-priced car just for the sake of an hour's fishing?" "It's certainly mighty strange," Frank reiterated. "After taking two cars from almost the same place, you'd imagine the thieves would be scared to come back." "They have plenty of nerve, that's certain." "It isn't as if the police haven't been busy. They've watched this road ever since the first car was lost, and the other autos were stolen just the same. They've kept an eye on both ends of the highway and there wasn't a sign of any of them."