21st Sep 1956

Frank and Joe Hardy introduce their new mystery.

28th Sep 1956

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.

5th Oct 1956

Rumor of hidden treasure belonging to old Mr. Applegate spurs a summer-long investigation by the Hardy Boys

12th Oct 1956

Joe finds Perry hiding in some bushes. Perry gives Joe a gold doubloon and asks him to hold it, then turns himself in.

19th Oct 1956

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.

26th Oct 1956

Rumor of hidden treasure belonging to Old man Applegate, spurs a summer long investigation by the Hardy Boys

2nd Nov 1956

The Boys go looking for treasure, and end up inside Applegate's house.

9th Nov 1956

Applegate relates to Frank and Joe how he got the gold and how it was stolen.

16th Nov 1956

Someone digs up Applegate's garden to get Frank and Joe in trouble.

23rd Nov 1956

While Frank and Joe wait for their father to get home, Iola goes to the Applegate house to retrieve the pick and shovel.

30th Nov 1956

Hiding from Applegate in the tower, Iola finds Jackley unconscious and tied up. Her screams brings Frank, Joe, and Fenton running.

7th Dec 1956

Fenton discovers Boles, the former gardener, hiding in the tower. The Hardys capture him.

14th Dec 1956

Frank, Joe, and Fenton search Boles apartment while the prisoner taunts them.

21st Dec 1956

Joe traps Boles into a partial confession.

28th Dec 1956

The Boys find a clue they think will solve the mystery of the Applegate treasure.

4th Jan 1957

The authorities look for the treasure in the tower.

11th Jan 1957

The Hardy bunch and police tear apart Applegate's tower structure looking for the stolen treasure.

18th Jan 1957

Frank and Joe spend a day following Boles after he is released from jail - and get another idea of where the treasure is hidden.

25th Jan 1957

Frank and Joe decide to follow Boles after he is released from jail.

1st Feb 1957

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.