Hostage Negotiator Career is a unique expansion and in order to play requires that you own the Hostage Negotiator base game and Hostage Negotiator Crime Wave. Plus, at least 7 Abductor Packs, one of which must be Abductor Pack #7
In most but not all years, you will be called to the scene of the latest hostage situation. Now, the result of each negotiation will impact the overall campaign and you'll be tracking your career stress, your personal stress, your merit level (for promotions), and your rank, among other things.
After the negotiation, you resolve a personal card and are once again faced with a narrative event to resolve and, based on the result of your negotiation in that "year", will be rewarded (or reprimanded) accordingly.