A 1920s chorus girl inherits a slain gangster's empire.

Frank and Joe Hardy are the sons of Fenton Hardy, a famous private detective. Finding everyday life at home in Bayport dull, the boys hope their father will let them work on one of his cases. Disappointed when he tells them his work is too dangerous for children, they are more determined than ever to follow in their dad's footsteps, and solve mysteries.

When an opportunity comes to help prove the new kid in town as innocent and find the long lost Applegate treasure, they jump on it. We follow the boys' case as they discover new twists and turns in the new case and in the mystery of the 10 year missing treasure.

When Larry Larkin's comic strip needs some freshening up, he calls in ghost-writer Francis X. Dignan to help him with the strip. Things get complicated when Francis rekindles his love for his ex-wife, who happens to be Larkin's secretary and soon-to-be wife.