Shortly before Christmas, four people are found shot dead at the home of the Stahlbergs, a wealthy family of shipping merchants notorious for their miserliness and infighting. Three of the victims are members of the family, and the fourth is an outsider, seemingly out of place. Cake had been set out in the living room and a bottle of champagne had been opened but not yet poured. Yes, family gatherings during the holidays can be difficult, but why...