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When a man selling leather goods door-to-door steals the key to their detective father's file cabinet, Frank and Joe Hardy set out to track him down. An odd mark on a key case which the man sold to their mother leads the teenage sleuths to an Indian village, whose chiefs begs them to help him find valuable tribal possessions and the deed for his land. How Frank and Joe find the missing deed and Ramapan treasures, how they prevent the phony lea...

Frank and Joe are covering the Formula One Championship in Indianapolis for the local newspaper. When one of the top racers lands in the hospital and another's garage is burned, the Hardy boys try find to the person behind these "accidents.

Once again Frank and Joe Hardy take on a puzzling case when their famous detective father asks the boys to assist him in tracking down a notorious jewel thief and his accomplices. The trail leads to the outskirts of the Hardys' home town and to a weirdly guarded mansion on the old Perth estate. With their pal Chet Morton, the brothers must tackle the mystery of the mansion heir's sudden death. A disappearing floor, a huge, savage-looking, houn...

An assignment form their famous detective father to track down a ring of credit-card counterfeiters takes Frank and Joe Hardy on an exciting camping trip to the Rocky Mountains. But the cross-country trek with their pals Chet Morton and Biff Hooper is jinxed from the very first day. Strange happenings on a nearly impassable mountain lure Frank, Joe, Chet, and Biff to almost certain death before they discover the sinister reason for the danger ...

Frank and Joe Hardy become involved in a case affecting national security when Joe dials a wrong telephone number and gets the Pentagon. Two words— "Bombay Boomerang”— that the boys hear before the line goes dead plunge them into a whirlpool of danger and intrigue. At the same time, Frank and Joe must save their father from a murderous gang stealing mercury shipments in the Baltimore harbor. With clues linking the mercury thefts to the top sec...

When dogs and men suddenly disappear, and strange screams fill the night, fantastic stories of vengeful ghosts are almost believable. It is these strange happenings which bring Frank and Joe Hardy to the Pocono Mountains to help their father's friend solve the mystery of Black Hollow. But when the Hardy boys and Chet Morton arrive at Captain Thomas Maguire's cabin on the edge of the hollow, he has disappeared. Frank and Joe are determined to f...

A STALKING WOLF! MONSTER SPIDERS AND SNAKES! THIS GAME IS REAL -- AND DEADLY!LEGENDARY COMPUTER GAME DESIGNER STEVEN ROYAL HAS DISAPPEARED -- WITH THE ONLY COMPLETE NEW GAME IN THE CHAOS SERIES. WITH JUST TWO WEEKS TO GO BEFORE THE GAME GOES INTO PRODUCTION. VIKING SOFTWARE, WHERE FRANK AND JOE'S FRIEND CHELSEA WORKS. IS IN BIG TROUBLE. THE BOYS MUST FIND THE MASTER DISK -- NOW!STRANGE E-MAILS LEAD THE BOYS INTO A DARK STEAM TUNNEL AND THEN TO...

It's time for Field Day at Bayport Elementary, and all the kids are excited. Whatever grade wins gets a pizza party, and the person with the highest personal score also gets a special prize. But when the field equipment is sabotaged, it looks like Field Day might not happen after all. Can Frank and Joe crack the case? Illustrations.