The River of Death

London in a year of severe drought; water level in the Thames river extremely low, blazing heat wave for 3 weeks in August; a Portuguese cargo ship sinks and contaminates a tributary of the Thames; 3 of the crew members are discovered to be dying of some disease; the local doctor is frightened by what he sees, calls the health authorities, who call for help from Professor Darbyshire, a scientist who deals with "fighting diseases in the bulk", someone we might call an environmental epidemiologist today; he investigates, then ... Yes, the sample was water from the contaminated Thames, the river from which roughly 4/5 of the water comes to supply the needs of the 5 million Londoners.