Robert Grant (January 24, 1852 – May 19, 1940) was an American author and a jurist who participated in a review of the Sacco and Vanzetti trial a few weeks before their executions.
There are also other authors on Goodreads with the name Robert Grant, including poet, hymn-writer, chairman of directors of the British East India Company and Governor of Bombay Sir Robert Grant MP (1779-1838), who wrote on the trade and government of India and the early history of the East India Company, as well as publishing a book of sacred poems.
I'm not surprised this is a forgotten work. Long boring polemics on the rights and wrongs of divorce as seen in the episcopal church, unfinished plot threads, unreal characters....the saving grace for me was the insight into early motoring,