Private investigator Lee Arnold and his Muslim assistant Mumtaz Hakim investigate the death of a young woman and find there's more to the case than meets the eye. Ex-soldier Lee Arnold and his Muslim assistant Mumtaz Hakim run a detective agency in London's ethnically diverse, crime-ridden East End. Mumtaz is approached by an Egyptian woman, Salwa, whose husband is in Belmarsh on terrorism charges. Salwa convinces Mumtaz of her husband's innocence and persuades her to go undercover to prove it. But Salwa is not what she seems. Trapped in an old tunnel that leads to the London docks, will Mumtaz escape with her life?