Tarnished Gold by Ann Aptaker

'New York City, 1950. Cantor Gold, art smuggler and dapper dyke-about-town, hunts for a missing masterpiece she's risked her life to bring through the port of New York. She must outsmart the Law that wants to jail her; outrun the dockside gangsters who would let her take the fall for murder; and outplay a shady art dealer, his lover, and a beautiful curator who toys with Cantor's passion. Through it all, Cantor must stay out of the gunsights of a killer who's knocking off rivals for the missing masterpiece--and stay alive to solve the mystery of her stolen love: Sophie de la Luna y Sol.' --