The Red Herring - S2.E37

A suspected case of salmonella leads Dr. Snoddie, as local Medical Officer of Health, to seal up a well used by a number of local residents. Dr. Finlay protests at the delay in clearing and reopening the well. But when distinguished specialist Sir James Greig visits Arden House for dinner and is struck down by a severe attack of food poisoning the search for the answer to the problem is widened considerably.