Joe Hardy

Frank Hardy

Frank and Joe are brothers and close partners in detective work, supporting each other through every mystery.

Chet Morton

Chet and Joe share a playful, easygoing friendship, with Chet often providing comic relief and moral support.

Biff Hooper

Biff and Joe are good friends, with Biff often joining Joe in adventurous and physical activities.

Mr. Hanleigh

Joe is directly opposed to Mr. Hanleigh, working with Frank to thwart Hanleigh's suspicious plans.

Elroy Jefferson

Elroy Jefferson is an antagonist to Joe, frequently clashing with the younger Hardy brother.

John Sparewell

Joe distrusts John Sparewell and sees him as an obstacle in the investigation.

Elroy Jefferson

Elroy Jefferson is an antagonist to Joe, frequently clashing with the younger Hardy brother.

Mr. Hanleigh

Joe is directly opposed to Mr. Hanleigh, working with Frank to thwart Hanleigh's suspicious plans.

John Sparewell

Joe distrusts John Sparewell and sees him as an obstacle in the investigation.

Frank Hardy

Frank and Joe are brothers and close partners in detective work, supporting each other through every mystery.

Chet Morton

Chet and Joe share a playful, easygoing friendship, with Chet often providing comic relief and moral support.

Frank Hardy

Frank and Joe are brothers and close partners in detective work, supporting each other through every mystery.

I: Iceboating on the Bay

Sits forward with Chet; enthusiastic about iceboating and the camping idea.

Heading for Trouble

Identifies Jefferson as the island's owner and recalls the car theft incident.

A Strange Note

Expresses amazement at the note and questions its meaning.

IV: Holiday Plans

Speculates about a reward, meets Iola, and accompanies Frank to Jefferson's home.

V: Mr. Hanleigh

Protests accepting the $100 reward but eventually accepts; supports Frank in asking about Hanleigh and Cabin Island.

Preparations

Anxious about missing Christmas presents, excited about the early Christmas dinner and gifts.

The Other Iceboat

Excitedly waves upon sighting Cabin Island; expresses suspicion about Hanleigh.

VIII: Suspicious Actions

Agrees with Frank's plan and later wonders about Hanleigh's measuring of the fireplace.

Night on Cabin Island

Comments on the storm and is initially frightened by the ghostly sound.

X: Stolen Supplies

Spots a figure on the island from a distance, jokes about Chet eating his boots, and insists on staying despite the theft.

XI: Postage Stamps

Accompanies Frank to the village; expresses interest in the stamp collection mystery and wonders if they could find it for Mr. Jefferson.

The Notebook

Discovers the notebook among the recovered supplies and suggests Sparewell and Hanleigh might be the same person.

The Cipher

Suggests Hanleigh and Sparewell might be the same man, helps interpret the notebook entries.

XIV: Christmas Day

Exchanges gifts with Frank, catches a fish through the ice, and remains confident they will catch the notebook's owner.

Chicken Thieves

Suggests visiting Amos Grice, enjoys the fox hunt, and participates in the chase.

The Chimney

Stays at the cabin as cook; spots the intruder and fires the signal shot; stays behind to guard the cabin during the search.

XVII: The Escape

Helps Frank hide and confront Hanleigh, struggles with him during the escape.

XVIII: The Cipher Solved

Draws the short straw and climbs the chimney, where he gets stuck in soot.

XIX: Disappointment

Gets stuck in the chimney while searching, emerges covered in soot, and reports finding nothing hidden.

A Cry for Help

First spots the iceboat in the storm and helps rescue Hanleigh.

XXII: The Letter

Assists Frank in swapping the coat and expresses amazement at the discovery about Hanleigh's uncle.

The Chimney Collapses

Supports Frank, reveals that the cipher has been solved, and joins Frank in examining the fallen chimney.

The Discovery

Listens to Hanleigh's confession and agrees with Frank's plan.

XXV: Elroy Jefferson Is Pleased

Supports Frank, expresses that the adventure was fun, and receives a $200 reward.