The author says:
When you lose everything, who are you? In November of 1929, the last autumn leaves started a domino effect in Fall River. At a time when most give thanks, others lurk at society’s fringes, waiting for a shot at revenge. Power. Redemption. A Mafia hit leaves Leo Riley homeless and at the mercy of Oguina, a powerful monster under an ancient curse. A hunter with skin in this game stalks the streets, playing cat-and-mouse with the creatures he’s sworn to eliminate. The capo di tutti capi with a secret gazes into a moral abyss, threatening to take his men with him if he falls. All struggle to hold on to humanity. Unlikely allies join forces, fighting for their rights to Fall River’s streets and their very survival. Some will fall, some will rise, but can there ever be a winner when crime and change come to call?
Genre: Alternative History, Speculative Fiction
Setting: 1929 New England
Target: Adult readers
So what I’m getting from the description is a Depression-era urban fantasy/crime drama. However, I’m seeing not seeing the urban fantasy part from the cover, just old-timey crime. I think that if you’re going to go for one or the other on your cover (crime drama or urban fantasy), urban fantasy is the way to go, because readers looking for urban fantasy are more likely to accept a historical crime setting setting than readers looking for crime drama are willing to accept urban fantasy in the story.
(I’m not saying you’ve GOT to choose one or the other; I’m just saying that, of the two, an urban fantasy cover would probably attract more interested readers than a crime drama cover.)