On the one hand, I understand the urge to write a book about Edgar Allan Poe, or one in which he is a main character. On the other hand, if you’re going to take this rather bold step, maybe do a bit better than this.
On the third hand, the book presents a multi-layered version of the doomed poet, a complicated figure already, here made more so by an acknowledgement of flaws. Maybe could have left out the cliche alcoholism, but still, a decent characterization.
On the fourth hand, this book is dated. Late 70s. Some of its racial dynamics wouldn’t fly today, and the whole magic/occult thing feels weird in the 21st century.
If you like pulpy, just-for-fun stuff, however, and you can get this cheap, go ahead and read it.