"How to Read a Person Like a Book" by Gerald I. Nierenberg and Henry H. Calero is a definitive guide to understanding nonverbal communication and deciphering the unspoken cues that people give in various situations. With their expertise, Nierenberg and Calero likely provide readers with valuable insights into body language, gestures, and facial expressions, helping them decode hidden meanings and emotions. Through practical examples and techniques, this book is likely designed to empower readers to enhance their interpersonal skills and navigate social and professional interactions with a heightened awareness of the messages conveyed through nonverbal communication.