Here is the start of the XML file from the start of the file to the end of head.
Code:
<?xml version="1.0" encoding="utf-8"?>
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:epub="http://www.idpf.org/2007/ops">
<head>
<title>Echoes in Death</title>
<link href="../styles/stylesheet.css" rel="stylesheet" type="text/css"/>
<meta content="http://www.w3.org/1999/xhtml; charset=utf-8" http-equiv="Content-Type"/>
</head>
That's very simple and it works.