Siena Rosso is a chanteuse who hits all the right notes on stage — and in the apartments of one raffish Viscount. Rosso is a working woman of the ton, hired to sing at the most lavish of balls and center stage at the opera house. But a clandestine affair can only satisfy Siena for so long, and she luckily has her fellow businesswoman Madame Genevieve Delacrois to confide in for her troubles… and to share a drink with on occasion.