The Speakeasy of Hell by Elizabeth N. Harris

He was often ignored, the quiet one who’d disappear when things got too much for him. Nobody knew where he went or why; they just accepted it because he was their brother. He liked the fact his brothers were finding their women, but he knew he was different. He couldn’t afford to fall. Not for a saucy woman who loved the 1920s and had a sassy mouth.
She didn’t care what people thought of her. Let them ridicule her and her style; she could handle that. She couldn’t handle watching her three cousins be miserable in the life they lived, and so they made plans to escape. As sweet as sugar, but when sugar is burned, it turns dark, just like her. Once they gained freedom, she had no intention of allowing anyone to take it from them. But the darkness holds many enemies, as she was about to find out.
He didn’t just fall; he dived deep and found he couldn’t breathe without her. She became his muse, his obsession, and he needed her. All of her. Every dark, delicious inch. A sweet face holds many a secret, as he well knew. But to claim her, he’d not only have to battle her enemies but his own. And when face to face with your monster, who wins? Only time will tell.