Lee Arnold and Mumtaz Hakim run a detective agency in London's East End. But their latest case could have devastating consequences. A young Asian couple move into a dilapidated house in Upton Park. The woman, Nasreen, spends her time working alone on the house, whilst her husband Abdullah goes to work. When Nasreen's friend, a homeless man, disappears she is reluctant to go to the police and reaches out to the Arnold Detective Agency. Mumtaz Hakim begins to dig into Abdullah's past and into the house itself which, she finds, holds its own grim secrets.