The book traces the evolution of American secret intelligence from its nascent beginnings to its modern, expansive form. Rhodri Jeffreys-Jones, a historian specializing in intelligence, details the growth of American covert operations, beginning with George Washington's use of a discretionary fund in the late 18th century. The narrative progresses through key historical periods, illustrating how secret intelligence became an increasingly significant component of national policy and expenditure, culminating in the early 21st century where U.S. intelligence spending dwarfed that of other global powers.

This historical account of American secret intelligence is regarded as a thorough and detailed examination of its subject. The book's strength lies in its chronological approach, meticulously charting the growth of covert operations and their increasing budgetary significance. It provides a solid foundation for understanding the historical trajectory of U.S. intelligence agencies. The work is likely to appeal to students of history, political science, and those interested in the evolution of national security apparatuses.