Frank and Joe Hardy find themselves entangled in a series of brazen burglaries while visiting New Orleans during the chaotic festivities of Mardi Gras. The brothers must navigate the crowded, vibrant streets of the city to identify a group of criminals operating under the cover of the holiday. They face opposition from elusive thieves who utilize the local atmosphere to mask their movements and evade capture. The narrative follows the classic Hardy Boys framework, utilizing a third-person perspective to track the brothers' investigative process as they gather clues and confront danger in an unfamiliar urban environment.

This entry in the long-running Hardy Boys series relies on the established dynamic between Frank and Joe to drive the mystery forward. The narrative leans into the atmospheric potential of its New Orleans setting, using the Mardi Gras backdrop to provide a distinct visual and thematic contrast to the brothers' usual stomping grounds. Readers familiar with the series will recognize the familiar beats of the investigation, which prioritize brisk pacing and straightforward problem-solving over complex character development. The story functions as a classic example of the mid-century juvenile detective genre, emphasizing the brothers' resourcefulness in the face of escalating criminal activity.