Death and the Language of Happiness — John Straley

Ninety-seven-year-old William Flynn is none too clear on what's happened this week, but he's razor-sharp on the events of eight decades past. What's happened this week is the murder of Angela Ramirez, a young woman who used to visit Flynn in the nursing home where he resides. The subsequent discovery in Flynn's room of the gun used to kill her makes him the prime suspect. Flynn wants Cecil Younger to find, and kill, the man he believes is responsible for Angela's murder: her husband.