I am the author of the document class, so I know!
There is no PDF documentation. It is in HTML format. When you install the package (or download the TDS from CTAN) the HTML documentation comes with it.
This is a LuaLaTeX-only package, so its TeX files are installed in (texroot)/tex/lualatex/novel, and its docs are in (texroot)/doc/lualatex/novel.
As was noted, last week I uploaded a version that has the HTML in a single file, so it can be read directly from CTAN. Click "HTML Documentation" link there.
The document class has actually been used for a novel (with cover artwork) submitted as PDF/X-1a:2001 and accepted on first attempt by a major American P.O.D. service.
Currently, I am revising the documentation again, and working out a few minor bugs that hardly any users will encounter. But don't let that stop you. By the time you understand the current usage, the newer version will be up.
You can find a complete (public domain) novel, with cover, created using this package. Find it in the "other" folder at the GitHub project page:
If you wonder why this document class doesn't create its own PDF documentation, the reason is simple: The class is tailored solely for print to paper (via PDF), therefore internal hyperlinks and bookmarks are prohibited. Besides, HTML looks better.