Eleanor has fled to the country and so Robert finds himself temporarily in charge of the Thrift. At Alice Costigan's suggestion, and against the advice of Dr. Marsham, he hires a young trainee, Charlotte Adler. Her first assignment is to make a detailed inventory of the infirmary, from which Dr. Marsham discovers that bed-linen and, more seriously, opium, is going missing. Young Sidney Bentley is the obvious suspect and, despite his protestations of innocence, is summarily dismissed.Meanwhile, Ethel has her hands full at home with her aged and rapidly declining mother. When the kindly shopkeeper from across the street, Mr. Collard, offers to help, she refuses to let him in--probably because she has had to tie her mother up to keep her from wandering about. When Charlotte stops by with some flowers while nurse Carr is out, she discovers Till Carr tied up and drugged with opium, and the truth comes out.

• Lucy Gannon

• Idris Elba
• Richard McCabe
• Jemma Redgrave