A routine investigation into a missing millionaire escalates into a complex pursuit across Europe, forcing Inspector Van der Valk to confront the moral ambiguity of his target. The protagonist, Inspector Van der Valk, operates with a methodical yet introspective approach as he tracks a wealthy man who has abandoned his life. He faces resistance from both the elusive subject and the rigid bureaucratic structures of international law enforcement. The narrative framework utilizes a third-person perspective that emphasizes the psychological tension between the investigator and the environment. The story moves through various European locales, grounding the investigation in the physical reality of post-war continental landscapes.

Readers and critics frequently note the atmospheric quality of the prose, which prioritizes character interiority over rapid-fire action sequences. Discussion often centers on the moral complexity of the protagonist and his unconventional methods for solving cases. Many observers highlight the author's ability to capture the specific cultural nuances of the European settings featured in the narrative. The pacing is described as deliberate and thoughtful, appealing to those who prefer character studies within the mystery genre. Overall, the work is recognized for its focus on the human elements of crime rather than purely mechanical puzzle-solving.