A friend recommended this book for improving interviewing techniques and for learning how to ask better questions. It is written by former CIA officers, contains good information on detecting deception, what questions to ask, and how to ask them. All of the examples in the book are from real-world situations and are relevant and entertaining.
Algorithms to Live By is a surprisingly fun book considering the subject. Contains mathematical philosophy on decision making on a wide range of topics. Including hiring, dating, real estate, sorting, and even doing laundry. At the top are several key quotes from the book, two of my favorites are "Inaction is just as irrevocable as action" and "Seizing the day and seizing a lifetime are two entirely different endeavors."
Written by the head of Google's People Operations. One of the best books I have read on company culture and hiring practices with a lot of practical and actionable advice included.