"Friendship." . . "Teenage boy detectives Fiction." . . "Detective and mystery stories, American." . . "juvenile mystery." . . "Friendship Fiction." . . "Hardy Boys (Fictitious characters) Juvenile fiction." . . "Hardy boys (Fictitious character) Fiction." . . "Missing persons." . . "American fiction Translations into Indonesian." . . "Detective and mystery stories." . . "Mystery and Detective Stories - Fiction." . . "Kidnapping Fiction." . . "Mystery fiction." . . "Mysteries & Detective Stories." . . "Hardy Boys - Fictitious Characters." . . "Mystery and detective stories." . . . . "Boy detectives Fiction." . . "Detective and mystery stories Juvenile literature." . . "Detective brothers Juvenile fiction." . . "Children's stories, English Translations into Hebrew." . . "Missing persons Fiction." . . "Something is amiss in Bayport, the Hardy Boys' home town. First, there is trouble in Shantytown, then a strange black craft tries to ram Joe and Frank's boat, the Sleuth. That night the local bank is robbed. And later that same night the young detectives' pals, Chet Morton and Biff Hooper, mysteriously disappear after a masquerade party. Are the events related?" . "Electronic books"@en . . "Frank and Joe use all their courage and skill to outwit the criminals who kidnapped their friends."@en . . "Joe and Frank piece together clues connecting a local bank robbery and the kidnapping of two friends." . . "De försvunna kompisarna" . "De försvunna kompisarna"@sv . . . "The Hardy boys investigate a robbery and the mysterious disappearance of their friends." . "The Hardy boys investigate a robbery and the mysterious disappearance of their friends."@en . "The missing chums : The Hardy boys" . . . . . . "The missing chums : the Hardy Boys"@en . "The missing chums (Hardy Boys#4)" . "Juvenile works"@en . "Juvenile works" . "Children's stories" . . . . . . "The missing chums"@en . "The missing chums" . . "Hilangnya sobat karib" . . . . . "Kadonneet kaverukset"@fi . . "Something is amiss in Bayport, the Hardy boys' hometown. First there is trouble in Shantytown, then a strange black craft tries to ram Joe and Frank's boat, the Sleuth. That night the local bank is robbed. And later that same night the young detectives' pals, Chet Morton and Biff Hooper, mysteriously disappear after a masquerade party. Are the events related? And do they emanate from Shantytown -- or from Hermit Island, an isolated land mass inhabited for many years by a strange recluse? Is it significant that both the missing boys and the bank robbers wore masquerade masks? Or is it more important that Chet was wearing a costume identical to Frank's? One by one, Frank and Joe tackle the clues, hardly daring to think what might have happened to their missing friends. But it is not until the two brothers confront the kidnappers that the overall pattern begins to emerge. The kidnappers ruthlessly plan to force Frank and Joe's famous detective father into choosing between justice and his sons! How the Hardy boys use all their courage and skill to outwit the criminals provides an exciting climax to one of the most baffling mysteries the young detectives have ever encountered. - Flyleaf."@en . "The Missing Chums" . . . . . . "A series of bizarre events in their home town lead the Hardy Boys on a trail of robbers and kidnappers."@en . "Adventure stories, American" . . . . . . . . . "The missing churms"@en . "Detective and mystery stories"@en . "Detective and mystery stories" . . . "Parashat bene ha-ʻarubah" . . . "The Missing Chums : the Hardy Boys 4"@en . "פרשת בני הערובה" . "Fiction" . . "Fiction"@en . "The Missing Chum # 4"@en . . . . . . . . "Missing chums. Swedish" . . . . . "When the Hardy boys set out to solve the mystery of their missing chums, they discover a gang hide-out in a cove on an island along the way."@en . . . . . . . . "Young adult fiction" . . . . . . "The Missing Chums / : Hardy Boys Series #4" . . . . . . . . . . . "Mystery fiction" . . . . "When the Hardy Boys set out to solve the mystery of their missing chums, they discover a gang hide-out in a cave on an island along the way."@en . "When the Hardy Boys set out to solve the mystery of their missing chums, they discover a gang hide-out in a cave on an island along the way." . "Mystery fiction"@en . . . . . . "<>"@he . . . . . . . . . . . . . "Kidnapping." . .