The murder of two wealthy oil tycoons forces Department Z operative Jim Burke into a high-stakes investigation that threatens national security. Jim Burke must navigate a web of corporate greed and lethal sabotage while attempting to identify an ambitious killer. As he tracks the perpetrator, Burke faces immediate physical danger, including a direct attempt on his own life that complicates his mission. The narrative follows a traditional procedural structure, focusing on the tactical maneuvers of a secret service agent operating under intense pressure.

Readers often identify this work as a quintessential example of mid-century British thriller writing. Discussion frequently centers on the efficiency of the plot and the rapid escalation of stakes that defines the Department Z series. Critics highlight the author's ability to maintain a consistent level of suspense despite the straightforward nature of the investigation. Many readers appreciate the focus on the protagonist's professional competence rather than excessive internal monologue. The book is frequently cited as a reliable entry for those who enjoy classic espionage tropes and fast-moving detective narratives.