In "The Mistress," Slice offers an unprecedented look at the life of "the other woman." Sarah Symonds, author and self-proclaimed former mistress of some very famous men, is on a mission. In each episode, Symonds attempts to rescue a woman caught up in an extramarital affair. With her knowledge, experience and an unusual perspective about infidelity, Symonds offers advice in the hope of empowering each woman. She tries to make women want more out of their lives and more for themselves.