Doc Martin visits the Flint brothers at the remote country home they share with their father Victor and mother Doreen. Martin is also deeply troubled by the arrival of Mark's rude, overbearing sister in the village: a herbalist who is prescribing his patients all sorts of remedies.

Doc Martin visits the Flint brothers at the remote country home they share with their father Victor and mother Doreen. Wallace and Paddy Flint have been suffering chronic stomach disorders, and a blood test confirms they have salmonella poisoning.

Martin discovers the cause of the problem is probably the putrid contents of their fridge. But there's something else odd about this family with has a bizarre passion for taxidermy. The brothers and their father refuse to allow the doctor any where near Doreen.

In the village, policeman Mark's sister has arrived from Truro to establish a new branch of her herbal remedy business. Positioning herself as a healer of equal standing to Martin, it's not long before half of Portwenn seems to be taking one of her concoctions - and many with serious side-effects.