The theft of a cursed yellow diamond from a young woman's bedroom on her eighteenth birthday triggers a complex investigation that unravels the secrets of an aristocratic household. Rachel Verinder finds herself at the center of a scandal when the priceless Moonstone vanishes, prompting a frantic search for the culprit. Opposing her are the social pressures of Victorian propriety and the relentless, mysterious pursuit of three Indian Brahmins determined to reclaim their sacred relic. The narrative unfolds through a multi-perspective framework, utilizing various accounts from house servants, lawyers, and investigators to piece together the truth behind the disappearance.

Widely recognized as a foundational text in the detective genre, this novel is frequently cited for its innovative use of multiple narrators to build suspense. Critics often highlight how the work successfully balances a domestic mystery with broader themes of colonial history and moral ambiguity. The intricate structure allows for a layered reading experience where the reader must constantly re-evaluate the testimony of each character. Modern analysis continues to focus on the psychological depth of the protagonists and the enduring influence of the plot mechanics on subsequent crime fiction.