Since you also asked for a way to eventually produce a small summary for the chapter, I would suggest you the epigraph
package to add this information; in the following example I defined a \mchapter
command with the following syntax:
\mchapter[<Title for the ToC>]{<Title for the document>}[<Summary text>]
The first two arguments behave exactly as those of the standard \chapter
command and the new third optional argument will contain the summary text typeset with the help of \epigraph
; \clearpage
is used at the end so that the following material will start in a new page:
\documentclass[openany]{book}
\usepackage{xparse}
\usepackage{epigraph}
\setlength\epigraphrule{0pt}
\renewcommand\epigraphflush{center}
\setlength\beforeepigraphskip{4\baselineskip}
\renewcommand\epigraphsize{\normalsize}
\setlength\epigraphwidth{0.6\textwidth}
\let\oldchapter\chapter
\NewDocumentCommand\mchapter{omo}
{
\IfNoValueTF{#1}
{\chapter{#2}}
{\chapter[#1]{#2}}
\IfNoValueTF{#3}
{\clearpage}
{\epigraph{#3}{\clearpage}}
}
\begin{document}
\tableofcontents
\mchapter[A Title for the ToC]{First Chapter}[A brief summary for the first chapter; here we add some more text just to illustrate the effect of this optional argument]
\mchapter[B Title for the ToC]{Second Chapter}
\mchapter[C Title for the ToC]{Third Chapter}[A brief summary for the third chapter; here we add some more text just to illustrate the effect of this optional argument]
\end{document}
