Zoë Wanamaker, Kara Tointon, Hannah Tointon and Leon Ockenden have joined Mr Selfridge for its third series. The casting announcement comes as it was confirmed that the third series of the ITV period drama will begin filming in London later this week. The third series picks up the story in 1919 just after the end of the first World War. My Family star Zoë Wanamaker joins the cast to play trouble-making Russian Princess, Marie de Bolotoff whose son Serge, played by Waterloo Road actor Leon Ockenden, married Harry Selfridge's eldest daughter Rosalie. Rosalie will be played by former EastEnders actress Kara Tointon, while her real-life sister - former Hollyoaks star Hannah Tointon - will play her rebellious younger sister Violette.