Under the Table (2016)

From the introduction:

Arthurian mythology meets Prohibition-era gangster fiction in this retelling of the Round Table set in a magic-infused alternate timeline during the days of Prohibition. The King’s Men are a legendary criminal syndicate known for bootlegging sangreal, a magical liquor, and the player characters are poised to climb the ladder. It’s an age of excess and limitless opportunities for those willing to reach out and take them...but things are tipping bad in Camelot, Illinois, and pretty soon the whole thing may just come tumbling down.

A little bit of magic, a little bit of luck, even more hard fighting, and a whole lot of blood built this mighty empire, but now the heat is coming down and betrayal, vengeance, and old grudges are boiling up. Honor and loyalty only go so far before the knives come out. Will you save the kingdom, tear it down—or take it for yourself?