The first case featured in this episode concerns the first ever murder trial where thallium, a heavy metal, was used as the murder weapon.
When the workforce of Hadlands factory in Hertfordshire started to come down with a terrible illness, they put it down to a bug that had been prevalent for some time. But when a store man died, workers began to lose their hair and suffered agonising and debilitating symptoms, they realised that something was very wrong.
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