A series of bizarre events in their home town lead the Hardy Boys on a trail of robbers and kidnappers. 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...

After a dying criminal confesses that his loot has been stashed "in the tower", the Hardy boys make an astonishing discovery.

The Hardy brothers embark on a freighter trip under mysterious circumstances and find themselves involved with a smuggling ring.

She thought she had her life back. She was wrong. It was a mistake to trust him. Shivering and bruised, a teen wakes up on the side of a dirt road with no memory of how she got there―or who she is. A passing officer takes her to the police station, and not long after, a frantic man arrives. He's been searching for her for hours. He has her school ID, her birth certificate, and even family photos. He is her father. Her name is Mary. Or so he says. When...

"When a hunting accident claims a boy's life, his best friends all come under suspicion"-- Provided by publisher.

Fenton Hardy, the famous private detective and father of the Hardy Boys, asks his sons to help him with his latest case involving a criminal named Snattman and the illegal drug trade smuggling of stolen drugs. Hardy directs Frank and Joe to a house on the cliff, whose location overlooking Barmet Bay offers an excellent vantage point to watch for smugglers. The Hardys are tricked into the house by cries for help, and are trapped for a short time in...

When their friend Sam gets a letter full of riddles from an eccentric millionaire, the Aldens are eager to help him crack the code. If Sam can solve the puzzle, he will inherit the millionaire's money! But Sam isn't the only one in town to receive a letter - and whoever solves the mystery first will win the prize!

Greenfield's famous basketball stars, Tipper and Buzz Nettleton, coach a community team that the Boxcar Children join. Then someone steals Tipper's MVP trophy and the Aldens investigate

The Hardy brothers travel to an Arizona ranch and eventually, Thailand in pursuit of jewel thieves who have stolen a priceless ruby.