Two of Four. In this sequel, Dinah Seabrooke starts at the Middle School and immediately makes herself noticed by running for class president on an environmental platform, arguing that the school should have a recycling program [apparently, when the book was written, recycling was still a rare event]. At the same time, Dinah befriends an elderly lady and takes on the issue of aging in dignity. A surprise ending leads to a satisfying conclusion.
I actually liked the sequel better than the original book, so I'm hoping the character continues to improve. Having established the various characters and settings in the story, Mills doesn't have to spend as long on exposition. One could quibble over some of the preachiness of the recycling message in the book, but it is not so distracting, as much as dated now.