Guido Tonelli is one of the most authoritative contemporary experimental physicists, a professor at the University of Pisa, a staff member of the European Organization for Nuclear Research, and the author of many articles and several popular science books. In “The Subtlest Imperfection That Gives Rise to Everything,” he tells about the discovery of one of the most mysterious elementary particles—the Higgs boson. Tonelli was directly involved in the events he describes—he worked at the Large Hadron Collider, served as the official representative of the experiment searching for the Higgs boson—and therefore his account of how the most important discovery in elementary particle physics of the last decades was made turned out to be vivid and personal.