Book excerpt: Here's the second entry in veteran author Claudia Mills' charming middle-grade series, which finds the lovably sardonic title character starting the fourth grade, which he's dreading: everyone in fourth grade is expected to join the school choir. And sing. In front of everyone. Mason can't think of many things he enjoys less than singing. But performing in front of other people might come close; Mason devises a foolproof plan that will keep him out of the spotlight on concert night. Of course, in the world of Mason Dixon, there is no such thing as a foolproof plan. There is only disaster.