When Vavara, a young orphaned Polish girl, is brought to serve at Empress Elizabeth's glittering, dangerous court in St Petersburg, she is schooled by the Chancellor himself in skills from lock-picking to love-making, learning above all else to stay silent — and listen. Soon, she is Elizabeth's 'tongue' — her secret eyes and ears. Then Sophie, a vulnerable young princess, arrives from Prussia as a prospective bride for Elizabeth's heir. Set to spy on her by the Empress, Vavara soon becomes her friend and confidante, and helps her navigate the illicit seductions and the treacherous shifting allegiances of the court. But Sophie's destiny is to become the notorious Catherine the Great. Are her ambitions more lofty and far-reaching than anyone suspected, and will she stop at nothing to achieve absolute power?