In 1891, just three years after the serial killer known as Jack the Ripper carried out his horrific crimes in Whitechapel, another sadistic murderer began targeting sex-workers in a different area of London. The Lambeth Poisoner had killed four young women before Scotland Yard detectives began to suspect murder. This time they were determined that the prolific killer would not escape justice. The task of catching the poisoner eventually fell to one of Scotland Yard's star detectives, as Inspected John Bennett Tunbridge began the most challenging and high-profile case of his career.

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