When a powerful CEO and his wife are shot to death in a deserted parking lot, the police investigate the husband's enemies. But Monk thinks it's all about the wife and the affair she was having with a handsome young ballplayer.

When the world's oldest man dies at a retirement center, Stottlemeyer's wife Karen insists that he investigate even though he--and everyone else--figure the man died of old age. Meanwhile, Karen kicks Stottlemeyer out of the house after a fight and Monk has him stay at his place.