\documentclass[a4paper]{book}
\usepackage[Lenny]{fncychap}

\begin{document}
\tableofcontents

\chapter{First Chapter}
This is first chapter. This is first chapter. This is first chapter. This is first chapter. This is first chapter. This is first chapter. This is first chapter. This is first chapter. This is first chapter. This is first chapter. 

This is first chapter. This is first chapter. This is first chapter. This is first chapter. This is first chapter. This is first chapter. This is first chapter. This is first chapter. This is first chapter. This is first chapter. 

This is first chapter. This is first chapter. This is first chapter. This is first chapter. This is first chapter. This is first chapter. This is first chapter. This is first chapter. This is first chapter. This is first chapter. 


\chapter{Second Chapter}
This is second chapter. This is second chapter. This is second chapter. This is second chapter. This is second chapter. This is second chapter. This is second chapter. This is second chapter. This is second chapter. 

This is second chapter. This is second chapter. This is second chapter. This is second chapter. This is second chapter. This is second chapter. This is second chapter. This is second chapter. This is second chapter. 

This is second chapter. This is second chapter. This is second chapter. This is second chapter. This is second chapter. This is second chapter. This is second chapter. This is second chapter. This is second chapter. 


\chapter{Third Chapter}
This is third chpater. This is third chpater. This is third chpater. This is third chpater. This is third chpater. This is third chpater. This is third chpater. This is third chpater. This is third chpater. This is third chpater. 

This is third chpater. This is third chpater. This is third chpater. This is third chpater. This is third chpater. This is third chpater. This is third chpater. This is third chpater. This is third chpater. This is third chpater. 

This is third chpater. This is third chpater. This is third chpater. This is third chpater. This is third chpater. This is third chpater. This is third chpater. This is third chpater. This is third chpater. This is third chpater. 


\end{document}