Frank and Joe Hardy investigate a series of strange occurrences at a coastal landmark known as Skeleton Rock, where a local legend of a ghost threatens to conceal a criminal operation. The teenage brothers must navigate the treacherous terrain of the shoreline and the hidden caves beneath the rock to uncover the truth behind the spectral sightings. Opposed by elusive smugglers and the dangerous environment of the coast, the brothers rely on their deductive reasoning and physical agility to survive. The narrative follows the classic third-person perspective characteristic of the series, focusing on the brothers' methodical approach to solving a localized mystery.

This title remains a staple of the long-running series, reflecting the formulaic yet reliable structure that defined the Hardy Boys franchise for decades. The narrative relies on the established dynamic between the two brothers, providing a consistent reading experience that emphasizes logic and bravery in the face of the unknown. Readers often appreciate the atmospheric setting of Skeleton Rock, which adds a layer of suspense to the standard investigative plot. The book serves as a representative example of mid-century juvenile detective fiction, prioritizing pacing and clear stakes over complex character development.