Is there a chapter to chapter summary of the book December Stillness?
You can discuss this modern text with other users of hte internet to frame chapter summaries. Otherwise,it would be useful to know whether you need this information to support teaching as a teacher or learning as a student. If the text you refer to is that written by Mary Downing Hahn then an approach to the text by teachers can be informed by educational papers such as the Paper presented at the Annual Meeting of the National Council of Teachers of English (83rd, Pittsburgh, PA, November 17-22, 1993). This paper entitled The Vietnam War in Young Adult Literature: Practical Approaches That Foster Response can be found at the Education Resources Education Center.
If you are a student looking for support for chapters you can find information in enotes on this author. As for specific information - there are lots of available summaries of this text.