Never Split the Difference by Chris Voss
I listened to this as an Audible after a family member raved about this book. Even if you think you do not negotiate or this book could not in any way possible apply to your life, you should read or listen to this book. The skills go beyond just hostage negotiate skill, it applies to all relationships in life. At some point you will have to negotiate, even if it is a price of something you are going to buy this book will give you tips on how to help yourself get the best deal you can. There are also relationship skills that are developed and addressed to help defuse an argument with a close friend or family member or defuse a situation at work. The book is overall a good read (or listen) and may be one that could help the reader encourage themselves to improve in some interpersonal skill in some way.