Semi-custom TOC numbering

I apologize if this has been asked before, but none of the other TOC questions seemed to precisely match what I am looking for.

I would like to, with as minimal as possible changes to the standard usage of the TOC package, create a TOC that alters just one chapter (the introduction).

For example with the following MWE of my current set up:

\documentclass{book}
\usepackage{hyperref}
\begin{document}

\tableofcontents

\chapter{Preamble}

\section{Motivation}
\section{Outline}

\chapter{Blah}
\section{Blah}
\section{Blah}

\chapter{Blah}
\section{Blah}
\section{Blah}
\end{document}


I get this output

1 Preamble
1.1 Motivation
1.2 Outline
2 Blah
2.1 Blah
2.2 Blah
3 Blah
3.1 Blah
3.2 Blah


Where what I would like is

  Preamble
Motivation
Outline
1 Blah
1.1 Blah
1.2 Blah
2 Blah
2.1 Blah
2.2 Blah


Thanks!

Here is a simple solution:

\documentclass{book}

\begin{document}

\tableofcontents
{\renewcommand\thesection{\arabic{section}}
\chapter*{Preamble}

\section{Motivation}
\section{Outline}
}

\chapter{Blah}
\section{Blah}
\section{Blah}

\chapter{Blah}
\section{Blah}
\section{Blah}

\end{document}


• Dear Bernard, thanks for your help! Unfortunately, that doesn't work. Namely, I realized that I forgot to mention that I am using \usepackage{hyperref} which seems to screw the whole affair up. I've editied accordingly. Sorry! – Alex Youcis Nov 21 '15 at 1:12
• There must be something else. Adding hyperref still works here with my code. Could you post a minimal non-working example? – Bernard Nov 21 '15 at 1:35
• It was no problem! I just made a slight mistake when typing in what you had written. Thanks! – Alex Youcis Nov 30 '15 at 3:58