My MWE is:
\documentclass{book}
\usepackage{showframe}
\usepackage{lipsum,multicol}
\pagestyle{empty}
\setlength{\columnseprule}{2pt}
%\setlength{\multicolsep}{-10pt}
\begin{document}
\lipsum[1]
\begin{multicols}{3}
\lipsum[1-10]
\end{multicols}
\end{document}
I would like to align rule
with top of the text. (see the example image).