The book fundamentally challenges traditional negotiation theory, particularly the idea of seeking compromise or a win-win outcome through purely rational means. Chris Voss, a former lead international kidnapping negotiator for the FBI, argues that negotiation is primarily a psychological and emotional process. Techniques honed in high-stakes, life-or-death hostage situations are surprisingly effective in everyday negotiations, from business deals and salary discussions to buying a car or resolving conflicts at home. The title itself is a rejection of the common advice to simply meet in the middle (split the difference), suggesting this often leads to suboptimal outcomes.