Black Sun: The Brief Transit and Violent Eclipse of Harry Croby by Geoffrey Wolff
The blurb on the back reads:
"Harry Crosby was the godson of J.P. Morgan and a friend of Ernest Hemmingway. Living in Paris in the Twenties and directing the Black Sun Press, which published James Joyce among others, Crosby was at the center of the wild life of the Lost Generation. Drugs, drink, sex, gambling, the deliberate derangement of the senses in the pursuit of transcendent revelation: these were Crosby's pastimes until 1929, when he shot his girlfriend, the recent bride of another man, and then himself."
It's brill. I am loving it tremendously.