Don't you love it when somebody has the good grace to go out at the top of their game? It can be depressing to watch former star performers embarrassing themselves because they didn't know when to quit. We have all seen them, the baseball players who strike out on pitches they used to hit or the lead singer who wrote the lyric "I hope I die before I get old" still out there on stage 50 years later gamely strumming away. Some writers keep plodding along, putting out books long after inspiration