The Sheriff and his sinister scientist, Joseph (pretending to be the Nightwatchman), test a poison, blaming the ill effects on the pestilence.
Casts:
Jonas Armstrong, Keith Allen, Richard Armitage, Sam Troughton, Gordon Kennedy, Joe Armstrong, Harry Lloyd, Anjali Jay, David Harewood, Lara Pulver, Joanne Froggatt, William Beck, Lucy Griffiths