Franklin W Dixon

Teenage detectives Frank and Joe Hardy solve two mysteries after becoming trapped in the old mill, including a case of counterfeiting, and a national security issue.

When Mr. Hardy disappears while investigating a mystery surrounding a vacant house rumored to be either haunted or an abode for criminals, the Hardy Boys search for the truth.

When Jack Dodd and his father are accused of stealing cars in Bayport, Frank and Joe work against the clock to prove their innocence while also searching for a lost treasure.

Frank and Joe solve a dangerous mystery involving a payroll robbery, a mine cave-in, a piano-playing ghost and a booby-trapped helicopter.

Frank and Joe investigate the power behind a possibly dangerous Utopian community and criminal activity within the oil industry.

Hired to locate an old Spanish cannon, the Hardy brothers uncover an even greater treasure after perilous underwater adventures.

Frank and Joe Hardy investigate the connection between two suspicious injuries sustained at the Rising Phoenix Martial Arts Center.

The search for missing gold takes the Hardy boys to the Yucatán Peninsula where they uncover a second mystery.

Brothers Frank and Joe Hardy, agents of American Teens Against Crime, are recruited to act as undercover bodyguards for wealthy celebrity Samantha Chilton who has come into possession of a map to a long-sought golden mummy in Egypt--a prize someone is apparently willing to kill for.

Frank and Joe Hardy, agents of the top secret American Teens Against Crime organization, cannot believe their luck when they are sent to a local diamond show and assigned to guard supermodels--who just may be diamond thieves.