Book Review of Quantum Field Theory by Lewis H. Ryder. An observation on Ryder's derivation of Dirac equation is made. The review ends as, "A rare combination of a thorough understanding and appreciation of the essential logical structure of quantum field theory and deep pedagogic skills have intermingled to create a masterpiece on the elementary introduction to quantum field theory in less than five hundred pages... . Without reservations, I give my strongest recommendation to every beginning student of physics to acquire and read Quantum Field Theory by L. H. Ryder."