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The Hardy brothers' search for the missing son of a wealthy industrialist leads them to Brazil and great danger.

Frank and Joe's investigation into the disappearance of their friend Phil Cohen, an electronics whiz, leads them to a top-secret plot that threatens the security of the entire world.

Collects no. 1-4 of the graphic novel series "The Hardy Boys: Undercover Brothers, " in which Frank and Joe investigate the theft of an art treasure, a stolen identity case, a murder on the set of a television program, and a series of mysterious accidents.

The Baker Street Irregulars return to help Sherlock Holmes with a strange mystery involving murder, abduction, and a search for lost treasure, and when a personal friend of Holmes disappears, the gang tries to determine whether there is a traitor in their ranks.

"A fourth action-filled puzzler for teen Sherlock as he plunges into a fight for his life and battles to discover what has happened to his missing friends"--Provided by publisher.

Nancy investigates two mysteries in which she travels to New York in search of a missing Chinese girl who is in danger; and goes to Hong Kong to find several missing beneficiaries to a will.

Sixteen-year-old Salvador "Slam" Amaro signs on as assistant coach of the girls' basketball team hoping to pad his resume to win a spot on the Ontario Under 17 men's team, but the job gets complicated when the head coach and the star point guard go missing, leaving him to solve the mystery and lead the team to victory.

A Japanese business tycoon mysteriously disappears and, soon after, a rare samurai sword is stolen from an art gallery.

The six members of the McGurk Detective Organization, young amateur detectives, are called on to help solve a case involving the disappearance of a reclusive mystery writer.

Sports reporter Paul Faustino reluctantly investigates the disappearance of a young soccer star from San Juan who has not been seen since he missed a winning penalty kick during a big game, and unknowingly the journalist becomes entangled in a world of slavery and the occult.

The disappearance of her husband is only the first of the mysteries Mrs.

Amateur sleuth Alec and his sidekick Gina investigate when the Christopher Columbus exhibit disappears from the museum.

Two teenage sleuths help their detective father search for a famous rocket scientist whose disappearance endangers the launching of the Firebird Rocket.

When Nancy and her friends travel to New York so that Nancy can participate in the next round of the Miss Pretty Face Beauty Pageant, they investigate shady dealings involving the cosmetics company that is sponsoring the contest.

The reader is asked to travel to Thailand to investigate the disappearance of an American businessman, and can choose between alternative adventures, each leading to nineteen possible endings.