-\documentclass{book}
+\documentclass[12pt]{book}
\usepackage[spanish]{babel}
+\usepackage[utf8]{inputenc}
+\usepackage[T1]{fontenc}
\title{Las corrientes del tiempo: Asalto al poder}
\author{Javier Sancho}
\maketitle
\input{cap01.tex}
\input{cap02.tex}
+\input{cap03.tex}
+\input{cap04.tex}
\end{document}