The sexy, sophisticated drama Mistresses returns with Joanna Lumley (Absolutely Fabulous) joining stars Shelley Conn (Terra Nova), Orla Brady (Fringe), Sharon Small (About a Boy) and Sarah Parish (The Pillars of the Earth) for its third and final series. All has changed as the once unbreakable bond between Katie, Trudi, Siobhan and Jessica has been shattered... The drama opens as Katie calls the girls together having not seen each other for months. But what could have caused these friends to split? As Trudi, Siobhan and Jessica join Katie, the drama moves back to five months earlier to reveal what happened. Back in the present, when one of the girls reveals a secret she has been hiding for the past year, will they see that they're all better off with, than without each other?