documentclass[openany]{book}

usepackage[
beramono,
eulermath,
pdfspacing,
dottedtoc
]{classicthesis}
usepackage{arsclassica}
usepackage[english]{babel}
usepackage[nottoc,numbib]{tocbibind}
usepackage{makeidx}

makeindex
makeatletter

begin{document}

addcontentsline{toc}{chapter}{Prologue}
chapter*{Prologue}
newpage mbox{} thispagestyle{empty}

tableofcontents
newpage mbox{} thispagestyle{empty}

chapter{Chapter 1}

Two words. index{Word}

backmatter

begin{thebibliography}{BC}
bibitem[Author 1]{Author 1} Author 1, emph{Book 1}.
end{thebibliography}

cleardoublepageprintindex

end{document}