I've searched this sites for similar questions, but can only find answers that remove the space for every chapter, whereas I only want it removed in one chapter. The MWE is quite minimal :)
\documentclass{book}
\begin{document}
\chapter{Chapter 1}
Hello
\chapter{Chapter 2}
Bonjour
\end{document}
How can I remove the white space above only one of the chapters?

\includewould not affect this at all, just put the redefinition either before the include or at the top of the included file, of course not all document classes necessarily define chapters in terms of\@makechapterhead– David Carlisle Jan 12 '17 at 07:47\chapter*{Chapter 2}instead of\chapter{Chapter 2}. Any alternative? – Vangelis Tasoulas Mar 22 '17 at 18:15\@makeschapterheadinstead of\@makechapterheadwhen you have the starred version of\chapter– Vangelis Tasoulas Mar 22 '17 at 18:21