After the new hydrofoil they are guarding is stolen, the Hardy boys face frequent danger in solving a mystery involving criminals who operate by signs of the zodiac.

The Hardy brothers must dismantle a dangerous crime gang in this first book of a fresh approach to a classic series. Teenagers Frank and Joe Hardy are supposedly retired from their detective work. But there is a new mystery in Bayport that needs their investigative expertise, and fast! Starting with a bank heist, a series of alarming pranks have popped up around Bayport. Ultimately harmless, the pranks turn out to be the work of Seth Diller, an amateur...

"Drop case or else danger for you and your family." This warning addressed to Fenton Hardy not only alarms the famous investigator and his detective sons, but also puzzles them, because Mr. Hardy is working on more than one case. Which one prompted the threat? When more ominous warnings follow, Frank and Joe suspect there is a link between the counterfeiting case they are investigating and a secret case their father cannot discuss since it involves...

When the rodeo comes to Bayport, Joe and Frank catch the ranch hands trying to steal a prize horse. After the boys stop the theft, they're recruited to help drive the cattle back to the ranch. However, mysterious things continue to happen and the Hardy boys have to solve the mystery.

Joe Hardy has joined the cast of a musical play based on a Sherlock Holmes investigation, but he has to call in his brother Frank to collaborate when someone tries to stop the show before it can go on.

While searching in Iceland for a missing sailor sought by an insurance company, the teen-age detective brothers uncover a plot threatening the life of a United States astronaut and the secrets of NASA's moon project.

The robbery of the treasure in the tower proves to be an exciting challenge to Frank and Joe. Frank and Joe attempt to foil a ruthless espionage ring in their effort to sabotage the United States space program.

"Detective brothers Frank and Joe search for a very special beetle. Frank and Joe are taking care of their friend's super cool pet stag beetle named Izumi for the weekend. Not only is this bug fun to watch, but he is also supposed to bring you luck! The first night with Izumi, Joe learns that stag beetles like to hiss and chirp...a lot. So, Joe decides to leave Izumi on the front stoop so he can get some sleep. But when Joe goes to get Izumi the next...

Detective brothers Frank and Joe Hardy are on the case when a sea star goes missing during their school field trip to the Bayport Aquarium.

Detective brothers Frank and Joe try to figure out who's spoiling the fun on a class trip in the third book in an all-new, interactive Hardy Boys chapter book mystery series. Frank and Joe Hardy are super-psyched for their school trip to Lake Poketoe. Along with their friends, they can t wait to go tubing, make s mores, and take nature walks. And Joe is particularly excited to try out his brand-new water skis during the trip! But when the group tries...