A complex inheritance dispute draws the Duke de Richleau and his associates into a web of criminal activity in Ceylon. Following the established dynamic of the Modern Musketeers, the narrative introduces a new generation, specifically Rex van Ryn's son and Richard Eaton's daughter, Fleur. As Fleur navigates personal autonomy and romantic entanglements, the group becomes entangled in a series of high-stakes threats including theft, arson, and murder. The Duke de Richleau must eventually orchestrate a final, solitary maneuver to secure the safety of his companions against these mounting dangers.

Readers often note the distinct shift in tone as the narrative transitions from the established exploits of the older generation to the inclusion of the younger characters. Discussion frequently centers on the balance between the romantic subplots and the central mystery involving the inheritance. Critics highlight the author's ability to maintain a consistent sense of urgency throughout the international setting. The pacing is described as methodical, building toward a final confrontation that tests the ingenuity of the Duke de Richleau. Many readers appreciate the continuity of the series while acknowledging the evolving social attitudes presented by the younger cast members.