September 21, 1956 · 30 min
Frank and Joe Hardy introduce their new mystery.
September 28, 1956 · 30 min
Iola's purse is stolen, and Frank and Joe track the suspected thief onto Silas Applegate's property. They spot Silas' plumber and hired hand before Silas comes out and orders them off the property.
October 5, 1956 · 30 min
Rumor of hidden treasure belonging to old Mr. Applegate spurs a summer-long investigation by the Hardy Boys
October 12, 1956 · 30 min
Joe finds Perry hiding in some bushes. Perry gives Joe a gold doubloon and asks him to hold it, then turns himself in.
October 19, 1956 · 30 min
The boys find a stash of stolen items from the community in Perry's living quarters. Though he is innocent of the thefts, Perry runs away to avoid capture by the police, when Joe stumbles upon his hiding place and learns the truth.
October 26, 1956 · 30 min
Rumor of hidden treasure belonging to Old man Applegate, spurs a summer long investigation by the Hardy Boys
November 2, 1956 · 30 min
The Boys go looking for treasure, and end up inside Applegate's house.
November 9, 1956 · 30 min
Applegate relates to Frank and Joe how he got the gold and how it was stolen.
November 16, 1956 · 30 min
Someone digs up Applegate's garden to get Frank and Joe in trouble.
November 23, 1956 · 30 min
While Frank and Joe wait for their father to get home, Iola goes to the Applegate house to retrieve the pick and shovel.
November 30, 1956 · 30 min
Hiding from Applegate in the tower, Iola finds Jackley unconscious and tied up. Her screams brings Frank, Joe, and Fenton running.
December 7, 1956 · 30 min
Fenton discovers Boles, the former gardener, hiding in the tower. The Hardys capture him.
December 14, 1956 · 30 min
Frank, Joe, and Fenton search Boles apartment while the prisoner taunts them.
December 21, 1956 · 30 min
Joe traps Boles into a partial confession.
December 28, 1956 · 30 min
The Boys find a clue they think will solve the mystery of the Applegate treasure.
January 4, 1957 · 30 min
The authorities look for the treasure in the tower.
January 11, 1957 · 30 min
The Hardy bunch and police tear apart Applegate's tower structure looking for the stolen treasure.
January 18, 1957 · 30 min
Frank and Joe spend a day following Boles after he is released from jail - and get another idea of where the treasure is hidden.
January 25, 1957 · 30 min
Frank and Joe decide to follow Boles after he is released from jail.
February 1, 1957 · 30 min
The Boys follow Boles back to his apartment but what they see from there leads them to deduce the location of the hidden treasure and bring the case to a conclusion.
