Three of four. Dinah organizes the first dance -- a sock hop Sadie Hawkins dance. Girls have to ask the boys to the dance. The problem is that Dinah doesn't like boys. And certainly not teh obnoxious Nick Tribble! Add in a debate on capital punishment and a play where Dinah gets the leading role, and there is the usual set of amusing hijinx. With Dinah, you can pretty much guess that the story is going to give us a series of mischief.
OK, so the books are charming and pleasant. Dinah learns to be a little bit flexible about her convictions and thus grows a bit. These are pleasant books and this third one in the series continues the general improvement of the characters and story.