The Ballad of Black Tom - Victor LaValle   is currently free on publisher TOR's (Macmillan) site at https://ebookclub.tor.com. Only free October 9 through midnight October 12.  

They tout it as "H.P. Lovecraft’s legacy has been the subject of intense debate. And this book has its finger on the pulse of that discussion."

Yeah, I'm late posting this but once again I did not get my email notice and only spotted it in today's emailed newsletter.

Publisher page for book details is https://us.macmillan.com/books/9780765386618 

This book's been on my radar as a must read, and it keeps getting more so.

What also adds in to all of this for me is I have a side project (hopefully eventually a conference paper) on transcending Lovecraft/the Cthulhu mythos as a cultural toolbox that goes beyond Lovecraft's limitations.  LaValle has a lot to say that REALLY ties in to this project (here and in other interviews)