From the introduction:
You...have been invited to the anniversary bash of Mr. Francis Fisk, a noted businessman. The attendees include a number of Fisk’s high-society friends, family members, and business associates. These high society sophisticates live in a world of intrigue, gossip, treachery and endless jockeying for social superiority.
Things take a turn for the deadly when a rolling blackout provides someone with the opportunity to advance their social agenda in a more brutally direct fashion than most of the guests are familiar with. When the lights come back on, a grisly crime is discovered!