The Fall of the House of Walworth

This book was plugged as a real life "Fall of the House of Usher" - notice the similarities in the name alone. This is the story of Manfield Walworth, an author of little note, and his wife, Ellen and their son, Frank.
Manfield and Ellen had a sordid relationship that included, but was not limited to many episodes of domestic violence.
Frank, through concern for his mother, commits the most heinous crime of all - patricide.

I wanted to hear more aobut what drove Frank to commit this terrible crime. Much was alluded to, including an inappropriate relationship between their father and Frank's younger sisters. Little was actually stated though.
The book starts out with the murder and some minor background details. After Frank is arrested, the author goes off on some historical tangent - going back and discussing even Mansfield's father and his marriage, political associations and more. How is this relevant to the story at hand? It was never clear.
I have to say that, as of today, December 17, this book has earned the dubious distinction of being the biggest Stinker of the year.