In what will surely stand as a bench mark of excellence in its field, Mr. Engberg has written a major work in sober contrast to the mass of ephemera that has been published on the subject of information protection and corporation espionage. With wit, amusing eccentricities, megalithic competence, and a seeming instinct for writing a definitive study, the author spins out the history, the sociology, and the high economics involved in the world of patents, trademarks, research and development programs, and the compiling, the protection, and the dissemination of information. The book goes beyond the discussion of bugging, secrets-passing, German shepherds, and the girl at the bar, by raising serious questions about the control of information, which, as he points out, is one of the major growth elements contributing to the expansion of our economy. Beside indicting the culprits, the author makes a series of constructive proposals that should rationalize the treatment of this sector of man's bounty. Without doubt important.