All That Glitters by Franca Nera

Marta Broderick: beautiful, successful art dealer, London lesbian. Marta inherits an art empire from the man who managed to spirit her out of East Berlin in the 1960's, Manny Schweitz. Marta has many secrets – for starters, she's dating a sexy married woman, Anne. Marta is also intent on completing Manny's unfinished business: recovering priceless pieces of art stolen by the Nazis.

But things get more complicated when she meets the gorgeous but mysterious Judith Compton. And as the relationship with Anne develops and blooms, Marta's dark sexual addiction to Judith – along with her quest to return the treasures to the rightful owners – is taking her to dangerous places.