Edith and Ada run a home for unmarried mothers in London's East End. Edith, a doctor, offers free medical help to the poor. Edith was separated from her twin girls Elka and Ania years before. She battles every day to overcome the pain of her past. Meanwhile, Ada struggles with a different type of fear - the threat of her dreaded sister returning. As the Nazis strengthen their grip on Poland, sisters Elka and Ania are forced to make a difficult decision. Should they travel to England to find their birth mother or stay and fight against an increasingly desperate regime?