Joe Hardy

Frank Hardy

Brothers and close partners in solving mysteries, with Frank as the more cautious leader.

Fenton Hardy

Father and son, with Fenton trusting Joe's instincts in detective work.

Lester

Friend and occasional helper, sharing information about local events.

Uncle Dock

Uncle and nephew, with Uncle Dock sharing his workshop and wisdom with Joe.

Fenton Hardy

Father and son, with Fenton trusting Joe's instincts in detective work.

Frank Hardy

Brothers and close partners in solving mysteries, with Frank as the more cautious leader.

Frank Hardy

Brothers and close partners in solving mysteries, with Frank as the more cautious leader.

Lester

Friend and occasional helper, sharing information about local events.

Uncle Dock

Uncle and nephew, with Uncle Dock sharing his workshop and wisdom with Joe.

Lester

Friend and occasional helper, sharing information about local events.

A Five Dollar Bill

Younger brother, fair-haired; contributes his change and accompanies Frank to the store and bank.

Counterfeit Money

Joe is initially angry but feels better when he realizes he lost only two dollars compared to Frank's three. He suggests the experience might lead to a bigger case.

The Hardy Boys at School

Blushes at the teasing but joins Frank in good-natured responses; mentions the motorboat like Tony Prito's.

Another Victim

Joins Frank on the school steps and discusses the counterfeit money situation.

V: Curing the Joker

Proposes visiting Carl Stummer's farm and joins in the retaliation against Chet.

The Old Mill

Eager to explore the mill; Stummer notes the boy at the mill resembles him.

In the Mill Race

Agrees with Frank about the men's suspicious appearance and suggests talking to the boy.

VIII: Joe's Courage

Displays immense courage by diving into the mill race to rescue Lester, fighting the current and clinging to a rock with the unconscious boy.

The Rescue

Joe struggles in the current while holding the unconscious Lester, then is rescued by Frank.

The New Boat

Joe is equally excited, takes a turn steering, and enjoys the boat's responsiveness.

A Man in a Hurry

Joe is fascinated by the fishermen's tales but agrees they should return; he also observes the stranger's anxious glances and the men on shore.

XII: Seasick

Joe disarms the stranger and helps tie him up after a physical struggle.

Paul Blum

Tends to the captive and knocks the revolver from Blum's hand during the struggle.

XIV: Con Riley Guards a Package

Joe joins in praising Riley's role in capturing Blum and is present when the news of Blum's escape arrives.

The Chase

Joe recalls the low gas in the Sleuth, which proves key to the capture.

A Plan of Action

Joe agrees with Frank's plan and recalls the suspicious behavior of the men at the mill when they offered a reward.

XVII: What Lester Said

Assists Frank in the investigation, asking pointed questions about the mill's activities and Lester's treatment.

XVIII: Suspicions

Accompanies Frank, witnesses the package exchange, and agrees that the mill occupants are not genuine scientists.

XIX: The Rug Buyer

Returns from school with Frank; expresses anger at the rug merchant and accompanies Frank to the police station.

XX: A Note of Warning

Agrees to impersonate Lester during the night investigation of the mill; excited about the plan.

At the Mill

Accompanies Frank, expresses concern about the bright moonlight, and agrees to the plan to climb the willow tree.

Through the Roof

Follows Frank's lead, assists in enlarging the roof hole, and helps maintain silence during the infiltration.

The Alarm

Joe accompanies Frank, witnesses the counterfeiting, and follows his brother's lead during the escape attempt.

Trapped

Assists Frank in the investigation and escape from the mill.

The Reckoning

Joe laughs at Lester's term 'detectiving' and joins Frank in celebrating the reward.