Becoming a mistress isn't something than most women set out to do, it just seems to happen. "Mistresses" follows the fortunes of a group of thirtysomethings that have been friends since university: Katie has become a doctor and has been secretly seeing a patient. Her best friend—Trudie—grieves the loss of her husband who died in 9/11. Then there's Jessica who is constantly the focus of the group's gossip and the seemingly happily married Siobhan. "Mistresses" is an epic tale of modern love and drama at its best.