The Like Switch: An Ex-FBI Agent's Guide to Influencing, Attracting, and Winning People Over by Jack Schafer, Marvin Karlins

The Like Switch (2015) is a guide to behavioral psychology and social influence written by Dr. Jack Schafer, a former FBI special agent, and Dr. Marvin Karlins. The book adapts "battlefield-tested" techniques—originally used for recruiting spies and profiling terrorists—into practical strategies for building rapport and winning people over in everyday social, professional, and romantic settings.