Hetty (Patricia Routledge) and Robert (Derek Benfield) arrive home after a long break with their son Derek and his family in Australia. Hetty has scarcely unpacked before she gets embroiled in a new case about hidden treasure. She and her assistant Geoff have been asked by Moira Pridwell to find a book written by her husband, who died in a recent explosion at the iron ore mine where he worked in Cumbria.
10.1 and 36.2