A group of four disparate, down-on-their-luck men concoct a scheme to blackmail a major international corporation by exploiting a secret communication channel. The protagonists, each facing personal or financial ruin, attempt to leverage their limited resources and technical knowledge to orchestrate a high-stakes deception. They face opposition from the very corporate entities they target, as well as the inherent instability of their own fragile alliance. The narrative unfolds through a cynical lens, highlighting the absurdity of their situation as they navigate the complex, often dangerous world of international intrigue.

Eric Ambler is widely regarded as a pioneer of the modern espionage novel, and this work is frequently cited for its departure from the romanticized tropes of the genre. Readers often note the author's ability to transform mundane, bureaucratic details into a source of genuine suspense. The narrative is characterized by its sharp wit and a pervasive sense of irony that keeps the reader questioning the motivations of every character involved. It remains a notable example of how the author uses the framework of a thriller to comment on the banality of greed and the fragility of institutional power.