The actress, who plays Elizabeth in 1923, the wife of Mirren and Ford's great-nephew, Jack Dutton (Darren Mann), tells PEOPLE what it's like to work with the iconic actors, who she calls "the greatest ...

Mann, however, thinks Jack has already earned his place. “She does, doesn’t she?” he joked about Cara’s unwavering faith in Spencer. “I notice that as well. Darren loves this perfectly ...