Frank and Joe, the Hardy boys, solve a mystery involving a magician, American secret agents, and international spy ring, and a Scottish castle.

The Hardy Boys have the honor of handling one of the giant balloons in the Bayport Fall Festival parade. But the day before the parade, the balloon is ripped, and everyone thinks Joe did it. Can the brothers find out who the real culprit is?

Joe Hardy is kidnapped by a gang of jewel smugglers as a warning for the Hardy Boys' father to stay away from their operation.

Right before the final game of the Little League season, the Bayport Bandits's lucky charm--Jason's mitt--goes missing! The team is devastated. Can Frank and Joe solve the case of the missing mitt before the Bandits lose the game?

Frank and Joe are brothers, but that won't stop them from competing against each other at the Fun World arcade's video game tournament. The boys make a bet: Whoever wins the competition gets to move into the cool new room their dad just built! But suddenly money goes missing. The owner of Fun World shuts down the tournament until the stolen cash is returned! Can the boys figure out who took it? Or will their chances of victory -- and a brand-new room!...

Frank and Joe investigate the legend of Whalebone Island when they receive a warning concerning a sunken freighter

"A medieval faire brings the past to life--and a mystery to the present--in this Hardy Brothers Secret Files adventure" -- "Frank and Joe Hardy are excited to visit the King Arthur Faire in Bayport. On Kid's Day, there are all kinds of special contests and events, like the Medieval Maze and Junior Jester Court Slam. The highlight of the day is the Junior Joust competition: whoever can stay on a mechanical horse and lance a golden ring with their...

During the the annual "Fun With Camping" event at Bayport State Park, Frank and Joe investigate when tent decorations start to go missing and they find mysterious footprints around the camp. "Frank and Joe are excited to go camping with their friends in Bayport State Park for the annual "Fun With Camping" event. They are ready for hiking, bonfires, and s'mores--and especially for the tent decorating competition, which the boys are determined to win....

Looking forward to seeing their favorite band at Bayport's Battle of the Bands, Frank and Joe Hardy are on the case when a bass guitar belonging to one of the band members goes missing, a situation that compromises the group's standing in the competition.

When television wildlife celebrities Jumpin' Jack and his son bring their menagerie to Bayport Elementary, Frank and Joe are on the case for a boa constrictor that goes missing.